diff --git a/apps/codecs.c b/apps/codecs.c
index 3fa05be59a..88478e8566 100644
--- a/apps/codecs.c
+++ b/apps/codecs.c
@@ -36,7 +36,6 @@
 #include "kernel.h"
 #include "screens.h"
 #include "misc.h"
-#include "mas.h"
 #include "codecs.h"
 #include "lang.h"
 #include "keyboard.h"
diff --git a/apps/debug_menu.c b/apps/debug_menu.c
index 2497b17826..bedc98ae10 100644
--- a/apps/debug_menu.c
+++ b/apps/debug_menu.c
@@ -61,7 +61,6 @@
 #include "rtc.h"
 #include "storage.h"
 #include "fat.h"
-#include "mas.h"
 #include "eeprom_24cxx.h"
 #if (CONFIG_STORAGE & STORAGE_MMC) || (CONFIG_STORAGE & STORAGE_SD)
 #include "sdmmc.h"
diff --git a/apps/menus/recording_menu.c b/apps/menus/recording_menu.c
index 6a1c1d31e8..8eaeab699c 100644
--- a/apps/menus/recording_menu.c
+++ b/apps/menus/recording_menu.c
@@ -49,7 +49,6 @@
 #endif
 #ifdef HAVE_RECORDING
 #include "peakmeter.h"
-#include "mas.h"
 #endif
 #include "splash.h"
 #if CONFIG_CODEC == SWCODEC
diff --git a/apps/mpeg.c b/apps/mpeg.c
index 62fda5e3cb..583e4e2122 100644
--- a/apps/mpeg.c
+++ b/apps/mpeg.c
@@ -45,7 +45,7 @@
 #include "settings.h"
 #ifndef SIMULATOR
 #include "i2c.h"
-#include "mas.h"
+#include "mas35xx.h"
 #include "system.h"
 #include "usb.h"
 #include "file.h"
@@ -53,7 +53,7 @@
 #endif /* !SIMULATOR */
 #ifdef HAVE_LCD_BITMAP
 #include "lcd.h"
-#endif
+#endif /* CONFIG_CODEC != SWCODEC */
 
 #define MPEG_SWAP_CHUNKSIZE  0x2000
 #define MPEG_HIGH_WATER  2 /* We leave 2 bytes empty because otherwise we
diff --git a/apps/plugin.h b/apps/plugin.h
index 56e0bfcd04..0503980c1e 100644
--- a/apps/plugin.h
+++ b/apps/plugin.h
@@ -77,7 +77,7 @@ void* plugin_get_buffer(size_t *buffer_size);
 #include "recording.h"
 #endif
 #else
-#include "mas.h"
+#include "mas35xx.h"
 #endif /* CONFIG_CODEC == SWCODEC */
 #include "settings.h"
 #include "timer.h"
diff --git a/apps/radio/radio.c b/apps/radio/radio.c
index 6f1903d79c..5fe1fabef0 100644
--- a/apps/radio/radio.c
+++ b/apps/radio/radio.c
@@ -23,7 +23,6 @@
 #include <stdio.h>
 #include <stdbool.h>
 #include <stdlib.h>
-#include "mas.h"
 #include "settings.h"
 #include "button.h"
 #include "status.h"
diff --git a/apps/recorder/peakmeter.c b/apps/recorder/peakmeter.c
index 2450559b8d..aacfc23cee 100644
--- a/apps/recorder/peakmeter.c
+++ b/apps/recorder/peakmeter.c
@@ -22,7 +22,6 @@
 #if defined(SIMULATOR) && (CONFIG_CODEC != SWCODEC)
 #include <stdlib.h> /* sim uses rand for peakmeter simulation */
 #endif
-#include "mas.h"
 #include "thread.h"
 #include "kernel.h"
 #include "settings.h"
diff --git a/apps/recorder/peakmeter.h b/apps/recorder/peakmeter.h
index 308e5fb916..4abcc154f3 100644
--- a/apps/recorder/peakmeter.h
+++ b/apps/recorder/peakmeter.h
@@ -22,6 +22,7 @@
 #define __PEAKMETER_H__
 
 #define PEAK_METER_FPS 20
+#define MAX_PEAK 0x8000
 
 /*#define PM_DEBUG */
 #ifdef PM_DEBUG 
diff --git a/apps/recorder/recording.c b/apps/recorder/recording.c
index 9adb3c1839..fdeae03f9b 100644
--- a/apps/recorder/recording.c
+++ b/apps/recorder/recording.c
@@ -42,7 +42,6 @@
 #include "pcm_record.h"
 #include "recording.h"
 #include "mp3_playback.h"
-#include "mas.h"
 #include "button.h"
 #include "kernel.h"
 #include "settings.h"
diff --git a/firmware/SOURCES b/firmware/SOURCES
index f118f6a396..5b7a582604 100644
--- a/firmware/SOURCES
+++ b/firmware/SOURCES
@@ -175,7 +175,7 @@ drivers/led.c
 drivers/button.c
 #if (CONFIG_PLATFORM & PLATFORM_NATIVE)
 #ifdef HAVE_DAC3550A
-drivers/dac.c
+drivers/audio/dac3550a.c
 #endif
 #ifdef HAVE_SERIAL
 drivers/serial.c
@@ -289,9 +289,6 @@ drivers/tuner/rda5802.c
 #endif /* BOOTLOADER */
 
 /* Sound */
-#if CONFIG_CODEC != SWCODEC
-mp3_playback.c
-#endif /* CONFIG_CODEC != SWCODEC */
 sound.c
 
 #if CONFIG_CODEC == SWCODEC
@@ -303,15 +300,6 @@ pcm.c
 enc_base.c
 #endif /* HAVE_RECORDING */
 #endif /* BOOTLOADER */
-
-#else  /* !SWCODEC */
-
-#ifndef BOOTLOADER
-#ifndef SIMULATOR
-drivers/mas.c
-#endif /* SIMULATOR */
-#endif /* BOOTLOADER */
-
 #endif /* SWCODEC */
 
 /* Audio codec */
@@ -574,6 +562,8 @@ target/sh/archos/player/lcd-player.c
 target/sh/archos/player/power-player.c
 target/sh/archos/player/powermgmt-player.c
 target/sh/archos/player/usb-player.c
+target/sh/archos/mascodec-archos.c
+target/sh/archos/audio-archos.c
 #endif /* SIMULATOR */
 #endif /* ARCHOS_PLAYER */
 
@@ -588,6 +578,8 @@ target/sh/archos/recorder/button-recorder.c
 target/sh/archos/recorder/power-recorder.c
 target/sh/archos/recorder/powermgmt-recorder.c
 target/sh/archos/recorder/usb-recorder.c
+target/sh/archos/mascodec-archos.c
+target/sh/archos/audio-archos.c
 #endif /* SIMULATOR */
 #endif /* ARCHOS_RECORDER */
 
@@ -602,6 +594,8 @@ target/sh/archos/fm_v2/button-fm_v2.c
 target/sh/archos/fm_v2/power-fm_v2.c
 target/sh/archos/fm_v2/powermgmt-fm_v2.c
 target/sh/archos/fm_v2/usb-fm_v2.c
+target/sh/archos/mascodec-archos.c
+target/sh/archos/audio-archos.c
 #endif /* SIMULATOR */
 #endif /* ARCHOS_FMRECORDER || ARCHOS_RECORDERV2 */
 
@@ -614,6 +608,8 @@ target/sh/archos/ondio/button-ondio.c
 target/sh/archos/ondio/power-ondio.c
 target/sh/archos/ondio/powermgmt-ondio.c
 target/sh/archos/ondio/usb-ondio.c
+target/sh/archos/mascodec-archos.c
+target/sh/archos/audio-archos.c
 #if (CONFIG_TUNER & TEA5767)
 target/sh/archos/ondio/fmradio_i2c-ondio.c
 #endif
diff --git a/firmware/drivers/dac.c b/firmware/drivers/audio/dac3550a.c
similarity index 89%
rename from firmware/drivers/dac.c
rename to firmware/drivers/audio/dac3550a.c
index f21ef9a802..e13602e481 100644
--- a/firmware/drivers/dac.c
+++ b/firmware/drivers/audio/dac3550a.c
@@ -5,7 +5,7 @@
  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
  *                     \/            \/     \/    \/            \/
- * $Id$
+ * $Id: dac.c 17847 2008-06-28 18:10:04Z bagder $
  *
  * Copyright (C) 2002 by Linus Nielsen Feltzing
  *
@@ -22,13 +22,19 @@
 #include "stdbool.h"
 #include "i2c.h"
 #include "debug.h"
-#include "dac.h"
-
-#ifdef HAVE_DAC3550A
+#include "dac3550a.h"
 
 static bool line_in_enabled = false;
 static bool dac_enabled = false;
 
+/* convert tenth of dB volume (-780..+180) to dac3550 register value */
+int tenthdb2reg(int db)
+{
+    if (db < -540)                  /* 3 dB steps */
+        return (db + 780) / 30;
+    else                            /* 1.5 dB steps */
+        return (db + 660) / 15;
+}
 
 int dac_volume(unsigned int left, unsigned int right, bool deemph)
 {
@@ -116,4 +122,3 @@ void dac_init(void)
     i2c_end();
 }
 
-#endif
diff --git a/firmware/drivers/audio/mas35xx.c b/firmware/drivers/audio/mas35xx.c
index 342d8a3c2e..e6cc665109 100644
--- a/firmware/drivers/audio/mas35xx.c
+++ b/firmware/drivers/audio/mas35xx.c
@@ -23,8 +23,8 @@
  ****************************************************************************/
 
 #include "config.h"
+#include "system.h" /* MAX MIN macros */
 #include "audiohw.h"
-#include "mas.h"
 
 const struct sound_settings_info audiohw_settings[] = {
 #if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F)
@@ -56,10 +56,15 @@ const struct sound_settings_info audiohw_settings[] = {
 #endif
 };
 
-
 int channel_configuration = SOUND_CHAN_STEREO;
 int stereo_width = 100;
 
+#if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F)
+unsigned long mdb_shape_shadow = 0;
+unsigned long loudness_shadow = 0;
+unsigned long shadow_io_control_main;
+#endif
+
 
 static void set_channel_config(void)
 {
@@ -181,13 +186,97 @@ void audiohw_set_treble(int val)
 }
 
 #if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F)
-void audiohw_set_volume(int val) {
+void audiohw_set_volume(int val) 
+{
     unsigned tmp = ((unsigned)(val + 115) & 0xff) << 8;
     mas_codec_writereg(MAS_REG_VOLUME_CONTROL, tmp);
 }
 
-void audiohw_set_balance(int val) {
+void audiohw_set_loudness(int value)
+{
+    loudness_shadow = (loudness_shadow & 0x04) |
+                       (MAX(MIN(value * 4, 0x44), 0) << 8);
+    mas_codec_writereg(MAS_REG_KLOUDNESS, loudness_shadow);
+}
+
+void audiohw_set_avc(int value)
+{
+    int tmp;
+
+    static const uint16_t avc_vals[] =
+    {
+        (0x1 << 8) | (0x8 << 12), /* 20ms */
+        (0x2 << 8) | (0x8 << 12), /* 2s */
+        (0x4 << 8) | (0x8 << 12), /* 4s */
+        (0x8 << 8) | (0x8 << 12), /* 8s */
+    };
+    switch (value) {
+        case 1:
+        case 2:
+        case 3:
+        case 4:
+            tmp = avc_vals[value -1];
+            break;
+        case -1: /* turn off and then turn on again to decay quickly */
+            tmp = mas_codec_readreg(MAS_REG_KAVC);
+            mas_codec_writereg(MAS_REG_KAVC, 0);
+            break;
+        default: /* off */
+            tmp = 0;
+            break;
+    }
+    mas_codec_writereg(MAS_REG_KAVC, tmp);
+}
+
+void audiohw_set_mdb_strength(int value)
+{
+    mas_codec_writereg(MAS_REG_KMDB_STR, (value & 0x7f) << 8);
+}
+
+void audiohw_set_mdb_harmonics(int value)
+{
+    int tmp = value * 127 / 100;
+    mas_codec_writereg(MAS_REG_KMDB_HAR, (tmp & 0x7f) << 8);
+}
+
+void audiohw_set_mdb_center(int value)
+{
+    mas_codec_writereg(MAS_REG_KMDB_FC, (value/10) << 8);
+}
+
+void audiohw_set_mdb_shape(int value)
+{
+    mdb_shape_shadow = (mdb_shape_shadow & 0x02) | ((value/10) << 8);
+    mas_codec_writereg(MAS_REG_KMDB_SWITCH, mdb_shape_shadow);
+}
+
+void audiohw_set_mdb_enable(int value)
+{
+    mdb_shape_shadow = (mdb_shape_shadow & ~0x02) | (value?2:0);
+    mas_codec_writereg(MAS_REG_KMDB_SWITCH, mdb_shape_shadow);
+}
+
+void audiohw_set_superbass(int value)
+{
+    loudness_shadow = (loudness_shadow & ~0x04) | (value?4:0);
+    mas_codec_writereg(MAS_REG_KLOUDNESS, loudness_shadow);
+}
+
+void audiohw_set_balance(int val) 
+{
     unsigned tmp = ((unsigned)(val * 127 / 100) & 0xff) << 8;
     mas_codec_writereg(MAS_REG_BALANCE, tmp);
 }
-#endif
+
+void audiohw_set_pitch(unsigned long val)
+{
+    mas_writemem(MAS_BANK_D0, MAS_D0_OFREQ_CONTROL, &val, 1);
+
+    /* We must tell the MAS that the frequency has changed.
+     * This will unfortunately cause a short silence. */
+
+    mas_writemem(MAS_BANK_D0, MAS_D0_IO_CONTROL_MAIN, &shadow_io_control_main, 1);
+}
+
+#endif /* CONFIG_CODEC == MAS3587F || CONFIG_CODEC == MAS3539F */
+
diff --git a/firmware/drivers/tuner/s1a0903x01.c b/firmware/drivers/tuner/s1a0903x01.c
index 3a417d73af..2c93ebdaad 100644
--- a/firmware/drivers/tuner/s1a0903x01.c
+++ b/firmware/drivers/tuner/s1a0903x01.c
@@ -27,7 +27,7 @@
 #include "tuner.h" /* tuner abstraction interface */
 #include "fmradio.h" /* physical interface driver */
 #include "sound.h"
-#include "mas.h"
+#include "mas35xx.h"
 #include "power.h"
 
 #define DEFAULT_IN1 0x100003 /* Mute */
diff --git a/firmware/export/audiohw.h b/firmware/export/audiohw.h
index 56f4d3dbea..930c671c20 100644
--- a/firmware/export/audiohw.h
+++ b/firmware/export/audiohw.h
@@ -59,6 +59,9 @@
 #include "as3514.h"
 #elif defined(HAVE_MAS35XX)
 #include "mas35xx.h"
+#if defined(HAVE_DAC3550A)
+#include "dac3550a.h"
+#endif /* HAVE_DAC3550A */
 #elif defined(HAVE_TSC2100)
 #include "tsc2100.h"
 #elif defined(HAVE_JZ4740_CODEC)
diff --git a/firmware/drivers/dac.h b/firmware/export/dac3550a.h
similarity index 88%
rename from firmware/drivers/dac.h
rename to firmware/export/dac3550a.h
index 121ce74e9d..3744b221ed 100644
--- a/firmware/drivers/dac.h
+++ b/firmware/export/dac3550a.h
@@ -5,7 +5,7 @@
  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
  *                     \/            \/     \/    \/            \/
- * $Id$
+ * $Id: dac.h 24158 2010-01-03 11:31:14Z Buschel $
  *
  * Copyright (C) 2002 by Linus Nielsen Feltzing
  *
@@ -18,13 +18,11 @@
  * KIND, either express or implied.
  *
  ****************************************************************************/
-#ifndef _DAC_H_
-#define _DAC_H_
+#ifndef _DAC3550A_H_
+#define _DAC3550A_H_
 
 #include "config.h"
 
-#ifdef HAVE_DAC3550A
-
 /*
     DAC I2C defs
 */
@@ -38,11 +36,12 @@
 #define DAC_AVOL        2
 #define DAC_GCFG        3
 
+/* function prototypes */
+extern int  tenthdb2reg(int db);
 extern int  dac_volume(unsigned int left, unsigned int right, bool deemph);
 extern void dac_enable(bool enable);
 extern void dac_line_in(bool enable);
 extern void dac_init(void);
 
-#endif
+#endif /* _DAC3550A_H_ */
 
-#endif
diff --git a/firmware/export/mas.h b/firmware/export/mas.h
deleted file mode 100644
index 9cbe970b94..0000000000
--- a/firmware/export/mas.h
+++ /dev/null
@@ -1,184 +0,0 @@
-/***************************************************************************
- *             __________               __   ___.
- *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
- *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
- *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
- *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
- *                     \/            \/     \/    \/            \/
- * $Id$
- *
- * Copyright (C) 2002 by Linus Nielsen Feltzing
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ****************************************************************************/
-#ifndef _MAS_H_
-#define _MAS_H_
-
-#define MAS_BANK_D0 0
-#define MAS_BANK_D1 1
-
-#define MAX_PEAK 0x8000
-
-/*
-    MAS I2C defs
-*/
-#if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F)
-#define MAS_ADR         0x3c
-#define MAS_DEV_WRITE   (MAS_ADR | 0x00)
-#define MAS_DEV_READ    (MAS_ADR | 0x01)
-
-#elif CONFIG_CODEC == MAS3507D
-#define MAS_ADR         0x3a
-#define MAS_DEV_WRITE   (MAS_ADR | 0x00)
-#define MAS_DEV_READ    (MAS_ADR | 0x01)
-#endif
-
-/* registers..*/
-#if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F)
-#define MAS_DATA_WRITE   0x68
-#define MAS_DATA_READ    0x69
-#define MAS_CODEC_WRITE  0x6c
-#define MAS_CODEC_READ   0x6d
-#define MAS_CONTROL      0x6a
-#define MAS_DCCF         0x76
-#define MAS_DCFR         0x77
-
-#elif CONFIG_CODEC == MAS3507D
-#define MAS_DATA_WRITE   0x68
-#define MAS_DATA_READ    0x69
-#define MAS_CONTROL      0x6a
-#endif
-
-/*
- *  MAS register
- */
-#define MAS_REG_DCCF            0x8e
-#define MAS_REG_MUTE            0xaa
-#define MAS_REG_PIODATA         0xc8
-#define MAS_REG_StartUpConfig   0xe6
-#define MAS_REG_KPRESCALE       0xe7
-#if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F)
-#define MAS_REG_KMDB_SWITCH     0x21
-#define MAS_REG_KMDB_STR        0x22
-#define MAS_REG_KMDB_HAR        0x23
-#define MAS_REG_KMDB_FC         0x24
-#define MAS_REG_KLOUDNESS       0x1e
-#define MAS_REG_QPEAK_L         0x0a
-#define MAS_REG_QPEAK_R         0x0b
-#define MAS_REG_DQPEAK_L        0x0c
-#define MAS_REG_DQPEAK_R        0x0d
-#define MAS_REG_VOLUME_CONTROL  0x10
-#define MAS_REG_BALANCE         0x11
-#define MAS_REG_KAVC            0x12
-#define MAS_REG_KBASS           0x14
-#define MAS_REG_KTREBLE         0x15
-
-#elif CONFIG_CODEC == MAS3507D
-#define MAS_REG_KBASS           0x6b
-#define MAS_REG_KTREBLE         0x6f
-#endif
-
-/*
- * MAS commands
- */
-#if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F)
-#define MAS_CMD_READ_ANCILLARY  0x50
-#define MAS_CMD_FAST_PRG_DL     0x60
-#define MAS_CMD_READ_IC_VER     0x70
-#define MAS_CMD_READ_REG        0xa0
-#define MAS_CMD_WRITE_REG       0xb0
-#define MAS_CMD_READ_D0_MEM     0xc0
-#define MAS_CMD_READ_D1_MEM     0xd0
-#define MAS_CMD_WRITE_D0_MEM    0xe0
-#define MAS_CMD_WRITE_D1_MEM    0xf0
-
-#elif CONFIG_CODEC == MAS3507D
-#define MAS_CMD_READ_ANCILLARY  0x30
-#define MAS_CMD_WRITE_REG       0x90
-#define MAS_CMD_WRITE_D0_MEM    0xa0
-#define MAS_CMD_WRITE_D1_MEM    0xb0
-#define MAS_CMD_READ_REG        0xd0
-#define MAS_CMD_READ_D0_MEM     0xe0
-#define MAS_CMD_READ_D1_MEM     0xf0
-#endif
-
-/* 
- * MAS D0 memory cells (MAS3587F / MAS3539F)
- */
-#if CONFIG_CODEC == MAS3587F
-#define MAS_D0_APP_SELECT        0x7f6
-#define MAS_D0_APP_RUNNING       0x7f7
-#define MAS_D0_ENCODER_CONTROL   0x7f0
-#define MAS_D0_IO_CONTROL_MAIN   0x7f1
-#define MAS_D0_INTERFACE_CONTROL 0x7f2
-#define MAS_D0_OFREQ_CONTROL     0x7f3
-#define MAS_D0_OUT_CLK_CONFIG    0x7f4
-#define MAS_D0_SPD_OUT_BITS      0x7f8
-#define MAS_D0_SOFT_MUTE         0x7f9
-#define MAS_D0_OUT_LL            0x7fc
-#define MAS_D0_OUT_LR            0x7fd
-#define MAS_D0_OUT_RL            0x7fe
-#define MAS_D0_OUT_RR            0x7ff
-#define MAS_D0_MPEG_FRAME_COUNT  0xfd0
-#define MAS_D0_MPEG_STATUS_1     0xfd1
-#define MAS_D0_MPEG_STATUS_2     0xfd2
-#define MAS_D0_CRC_ERROR_COUNT   0xfd3
-
-#elif CONFIG_CODEC == MAS3539F
-#define MAS_D0_APP_SELECT        0x34b
-#define MAS_D0_APP_RUNNING       0x34c
-/* no encoder :( */
-#define MAS_D0_IO_CONTROL_MAIN   0x346
-#define MAS_D0_INTERFACE_CONTROL 0x347
-#define MAS_D0_OFREQ_CONTROL     0x348
-#define MAS_D0_OUT_CLK_CONFIG    0x349
-#define MAS_D0_SPD_OUT_BITS      0x351
-#define MAS_D0_SOFT_MUTE         0x350
-#define MAS_D0_OUT_LL            0x354
-#define MAS_D0_OUT_LR            0x355
-#define MAS_D0_OUT_RL            0x356
-#define MAS_D0_OUT_RR            0x357
-#define MAS_D0_MPEG_FRAME_COUNT  0xfd0
-#define MAS_D0_MPEG_STATUS_1     0xfd1
-#define MAS_D0_MPEG_STATUS_2     0xfd2
-#define MAS_D0_CRC_ERROR_COUNT   0xfd3
-
-#elif CONFIG_CODEC == MAS3507D
-#define MAS_D0_MPEG_FRAME_COUNT  0x300
-#define MAS_D0_MPEG_STATUS_1     0x301
-#define MAS_D0_MPEG_STATUS_2     0x302
-#define MAS_D0_CRC_ERROR_COUNT   0x303
-#define MAS_D0_OUT_LL            0x7f8
-#define MAS_D0_OUT_LR            0x7f9
-#define MAS_D0_OUT_RL            0x7fa
-#define MAS_D0_OUT_RR            0x7fb
-
-#endif
-
-int mas_default_read(unsigned short *buf);
-int mas_run(unsigned short address);
-int mas_readmem(int bank, int addr, unsigned long* dest, int len);
-int mas_writemem(int bank, int addr, const unsigned long* src, int len);
-int mas_readreg(int reg);
-int mas_writereg(int reg, unsigned int val);
-void mas_reset(void);
-int mas_direct_config_read(unsigned char reg);
-int mas_direct_config_write(unsigned char reg, unsigned int val);
-int mas_codec_writereg(int reg, unsigned int val);
-int mas_codec_readreg(int reg);
-unsigned long mas_readver(void);
-
-#endif
-
-#if CONFIG_TUNER & S1A0903X01
-void mas_store_pllfreq(int freq);
-int mas_get_pllfreq(void);
-#endif
-
diff --git a/firmware/export/mas35xx.h b/firmware/export/mas35xx.h
index 1c50b7f02b..f75658fce1 100644
--- a/firmware/export/mas35xx.h
+++ b/firmware/export/mas35xx.h
@@ -25,28 +25,56 @@
 #define _MAS35XX_H
 
 #include "config.h"
+#include "mascodec.h"
+
+#define MAS_BANK_D0 0
+#define MAS_BANK_D1 1
+
+/* registers common to all MAS35xx */
+#define MAS_REG_DCCF            0x8e
+#define MAS_REG_MUTE            0xaa
+#define MAS_REG_PIODATA         0xc8
+#define MAS_REG_StartUpConfig   0xe6
+#define MAS_REG_KPRESCALE       0xe7
 
 #if CONFIG_CODEC == MAS3507D
 
+/* I2C defines */
+#define MAS_ADR         0x3a
+#define MAS_DEV_WRITE   (MAS_ADR | 0x00)
+#define MAS_DEV_READ    (MAS_ADR | 0x01)
+
+/* MAS3507D registers */
+#define MAS_DATA_WRITE   0x68
+#define MAS_DATA_READ    0x69
+#define MAS_CONTROL      0x6a
+
+#define MAS_REG_KBASS           0x6b
+#define MAS_REG_KTREBLE         0x6f
+
+/* MAS3507D commands */
+#define MAS_CMD_READ_ANCILLARY  0x30
+#define MAS_CMD_WRITE_REG       0x90
+#define MAS_CMD_WRITE_D0_MEM    0xa0
+#define MAS_CMD_WRITE_D1_MEM    0xb0
+#define MAS_CMD_READ_REG        0xd0
+#define MAS_CMD_READ_D0_MEM     0xe0
+#define MAS_CMD_READ_D1_MEM     0xf0
+
+/* MAS3507D D0 memmory cells */
+#define MAS_D0_MPEG_FRAME_COUNT  0x300
+#define MAS_D0_MPEG_STATUS_1     0x301
+#define MAS_D0_MPEG_STATUS_2     0x302
+#define MAS_D0_CRC_ERROR_COUNT   0x303
+#define MAS_D0_OUT_LL            0x7f8
+#define MAS_D0_OUT_LR            0x7f9
+#define MAS_D0_OUT_RL            0x7fa
+#define MAS_D0_OUT_RR            0x7fb
+
 #define VOLUME_MIN -780
 #define VOLUME_MAX  180
 #define AUDIOHW_CAPS (BASS_CAP | TREBLE_CAP | PRESCALER_CAP)
 
-#else /* CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F */
-
-/* MAS3587F and MAS3539F handle clipping prevention internally so we do not need
- * the prescaler -> CLIPPING_CAP
- */
-
-#define VOLUME_MIN -400
-#define VOLUME_MAX  600
-#define AUDIOHW_CAPS (BASS_CAP | TREBLE_CAP | BALANCE_CAP | CLIPPING_CAP)
-
-#endif
-
-
-#if CONFIG_CODEC == MAS3507D
-
 static const unsigned int bass_table[] =
 {
     0x9e400, /* -15dB */
@@ -136,6 +164,112 @@ static const unsigned int prescale_table[] =
     0xe6800, /* 14dB */
     0xe9400  /* 15dB */
 };
-#endif /*CONFIG_CODEC == MAS3507D*/
+
+#else /* CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F */
+
+/* I2C defines */
+#define MAS_ADR         0x3c
+#define MAS_DEV_WRITE   (MAS_ADR | 0x00)
+#define MAS_DEV_READ    (MAS_ADR | 0x01)
+
+/* MAS3587F/MAS3539F registers */
+#define MAS_DATA_WRITE   0x68
+#define MAS_DATA_READ    0x69
+#define MAS_CODEC_WRITE  0x6c
+#define MAS_CODEC_READ   0x6d
+#define MAS_CONTROL      0x6a
+#define MAS_DCCF         0x76
+#define MAS_DCFR         0x77
+
+#define MAS_REG_KMDB_SWITCH     0x21
+#define MAS_REG_KMDB_STR        0x22
+#define MAS_REG_KMDB_HAR        0x23
+#define MAS_REG_KMDB_FC         0x24
+#define MAS_REG_KLOUDNESS       0x1e
+#define MAS_REG_QPEAK_L         0x0a
+#define MAS_REG_QPEAK_R         0x0b
+#define MAS_REG_DQPEAK_L        0x0c
+#define MAS_REG_DQPEAK_R        0x0d
+#define MAS_REG_VOLUME_CONTROL  0x10
+#define MAS_REG_BALANCE         0x11
+#define MAS_REG_KAVC            0x12
+#define MAS_REG_KBASS           0x14
+#define MAS_REG_KTREBLE         0x15
+
+/* MAS3587F/MAS3539F commands */
+#define MAS_CMD_READ_ANCILLARY  0x50
+#define MAS_CMD_FAST_PRG_DL     0x60
+#define MAS_CMD_READ_IC_VER     0x70
+#define MAS_CMD_READ_REG        0xa0
+#define MAS_CMD_WRITE_REG       0xb0
+#define MAS_CMD_READ_D0_MEM     0xc0
+#define MAS_CMD_READ_D1_MEM     0xd0
+#define MAS_CMD_WRITE_D0_MEM    0xe0
+#define MAS_CMD_WRITE_D1_MEM    0xf0
+
+/* MAS3587F D0 memory cells */
+#if CONFIG_CODEC == MAS3587F
+#define MAS_D0_APP_SELECT        0x7f6
+#define MAS_D0_APP_RUNNING       0x7f7
+#define MAS_D0_ENCODER_CONTROL   0x7f0
+#define MAS_D0_IO_CONTROL_MAIN   0x7f1
+#define MAS_D0_INTERFACE_CONTROL 0x7f2
+#define MAS_D0_OFREQ_CONTROL     0x7f3
+#define MAS_D0_OUT_CLK_CONFIG    0x7f4
+#define MAS_D0_SPD_OUT_BITS      0x7f8
+#define MAS_D0_SOFT_MUTE         0x7f9
+#define MAS_D0_OUT_LL            0x7fc
+#define MAS_D0_OUT_LR            0x7fd
+#define MAS_D0_OUT_RL            0x7fe
+#define MAS_D0_OUT_RR            0x7ff
+#define MAS_D0_MPEG_FRAME_COUNT  0xfd0
+#define MAS_D0_MPEG_STATUS_1     0xfd1
+#define MAS_D0_MPEG_STATUS_2     0xfd2
+#define MAS_D0_CRC_ERROR_COUNT   0xfd3
+
+/* MAS3539F D0 memory cells */
+#elif CONFIG_CODEC == MAS3539F
+#define MAS_D0_APP_SELECT        0x34b
+#define MAS_D0_APP_RUNNING       0x34c
+/* no encoder :( */
+#define MAS_D0_IO_CONTROL_MAIN   0x346
+#define MAS_D0_INTERFACE_CONTROL 0x347
+#define MAS_D0_OFREQ_CONTROL     0x348
+#define MAS_D0_OUT_CLK_CONFIG    0x349
+#define MAS_D0_SPD_OUT_BITS      0x351
+#define MAS_D0_SOFT_MUTE         0x350
+#define MAS_D0_OUT_LL            0x354
+#define MAS_D0_OUT_LR            0x355
+#define MAS_D0_OUT_RL            0x356
+#define MAS_D0_OUT_RR            0x357
+#define MAS_D0_MPEG_FRAME_COUNT  0xfd0
+#define MAS_D0_MPEG_STATUS_1     0xfd1
+#define MAS_D0_MPEG_STATUS_2     0xfd2
+#define MAS_D0_CRC_ERROR_COUNT   0xfd3
+#endif
+
+/* MAS3587F and MAS3539F handle clipping prevention internally so we do not need
+ * the prescaler -> CLIPPING_CAP
+ */
+
+#define VOLUME_MIN -400
+#define VOLUME_MAX  600
+#define AUDIOHW_CAPS (BASS_CAP | TREBLE_CAP | BALANCE_CAP | CLIPPING_CAP)
+
+#endif /* CONFIG_CODEC */
+
+/* Function prototypes */
+#if CONFIG_CODEC == MAS3587F || CONFIG_CODEC == MAS3539F
+extern void audiohw_set_loudness(int value);
+extern void audiohw_set_avc(int value);
+extern void audiohw_set_mdb_strength(int value);
+extern void audiohw_set_mdb_harmonics(int value);
+extern void audiohw_set_mdb_center(int value);
+extern void audiohw_set_mdb_shape(int value);
+extern void audiohw_set_mdb_enable(int value);
+extern void audiohw_set_superbass(int value);
+extern void audiohw_set_balance(int val);
+extern void audiohw_set_pitch(unsigned long val);
+#endif
 
 #endif /* _MAS35XX_H */
diff --git a/firmware/export/mascodec.h b/firmware/export/mascodec.h
new file mode 100644
index 0000000000..82a71e30c8
--- /dev/null
+++ b/firmware/export/mascodec.h
@@ -0,0 +1,43 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id: mas.h 24154 2010-01-03 10:27:43Z Buschel $
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef _MASCODEC_H_
+#define _MASCODEC_H_
+
+int mas_default_read(unsigned short *buf);
+int mas_run(unsigned short address);
+int mas_readmem(int bank, int addr, unsigned long* dest, int len);
+int mas_writemem(int bank, int addr, const unsigned long* src, int len);
+int mas_readreg(int reg);
+int mas_writereg(int reg, unsigned int val);
+void mas_reset(void);
+int mas_direct_config_read(unsigned char reg);
+int mas_direct_config_write(unsigned char reg, unsigned int val);
+int mas_codec_writereg(int reg, unsigned int val);
+int mas_codec_readreg(int reg);
+unsigned long mas_readver(void);
+
+#endif
+
+#if CONFIG_TUNER & S1A0903X01
+void mas_store_pllfreq(int freq);
+int mas_get_pllfreq(void);
+#endif
+
diff --git a/firmware/sound.c b/firmware/sound.c
index bede18615a..82d5cdf47d 100644
--- a/firmware/sound.c
+++ b/firmware/sound.c
@@ -26,16 +26,17 @@
 #include "logf.h"
 #include "system.h"
 #include "i2c.h"
-#include "mas.h"  
 #if (CONFIG_PLATFORM & PLATFORM_NATIVE)
 #if CONFIG_CPU == PNX0101
 #include "pnx0101.h"
-#endif
-#include "dac.h"
+#endif /* CONFIG_CPU == PNX101 */
 #if CONFIG_CODEC == SWCODEC
 #include "pcm.h"
+#else /* !CONFIG_CODEC == HWCODEC */
+#include "mas35xx.h"
+#include "dac3550a.h"
 #endif
-#endif
+#endif /* !SIMULATOR */
 
 /* TODO
  * find a nice way to handle 1.5db steps -> see wm8751 ifdef in sound_set_bass/treble
@@ -162,18 +163,6 @@ void sound_set_dsp_callback(int (*func)(int, intptr_t))
 }
 #endif
 
-#if (CONFIG_CODEC == MAS3507D) && !defined(SIMULATOR)
-/* convert tenth of dB volume (-780..+180) to dac3550 register value */
-static int tenthdb2reg(int db)
-{
-    if (db < -540)                  /* 3 dB steps */
-        return (db + 780) / 30;
-    else                            /* 1.5 dB steps */
-        return (db + 660) / 15;
-}
-#endif
-
-
 #if !defined(AUDIOHW_HAVE_CLIPPING)
 /*
  * The prescaler compensates for any kind of boosts, to prevent clipping.
@@ -282,12 +271,6 @@ static void set_prescaled_volume(void)
 }
 #endif /* (CONFIG_CODEC == MAS3507D) || defined HAVE_UDA1380 */
 
-
-#if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F)
-static unsigned long mdb_shape_shadow = 0;
-static unsigned long loudness_shadow = 0;
-#endif
-
 void sound_set_volume(int value)
 {
     if(!audio_is_initialized)
@@ -620,86 +603,64 @@ void sound_set_loudness(int value)
 {
     if(!audio_is_initialized)
         return;
-    loudness_shadow = (loudness_shadow & 0x04) |
-                       (MAX(MIN(value * 4, 0x44), 0) << 8);
-    mas_codec_writereg(MAS_REG_KLOUDNESS, loudness_shadow);
+
+    audiohw_set_loudness(value);
 }
 
 void sound_set_avc(int value)
 {
     if(!audio_is_initialized)
         return;
-    int tmp;
 
-    static const uint16_t avc_vals[] =
-    {
-        (0x1 << 8) | (0x8 << 12), /* 20ms */
-        (0x2 << 8) | (0x8 << 12), /* 2s */
-        (0x4 << 8) | (0x8 << 12), /* 4s */
-        (0x8 << 8) | (0x8 << 12), /* 8s */
-    };
-    switch (value) {
-        case 1:
-        case 2:
-        case 3:
-        case 4:
-            tmp = avc_vals[value -1];
-            break;
-        case -1: /* turn off and then turn on again to decay quickly */
-            tmp = mas_codec_readreg(MAS_REG_KAVC);
-            mas_codec_writereg(MAS_REG_KAVC, 0);
-            break;
-        default: /* off */
-            tmp = 0;
-            break;
-    }
-    mas_codec_writereg(MAS_REG_KAVC, tmp);     
+    audiohw_set_avc(value);
 }
 
 void sound_set_mdb_strength(int value)
 {
     if(!audio_is_initialized)
         return;
-    mas_codec_writereg(MAS_REG_KMDB_STR, (value & 0x7f) << 8); 
+
+    audiohw_set_mdb_strength(value);
 }
 
 void sound_set_mdb_harmonics(int value)
 {
     if(!audio_is_initialized)
         return;
-    int tmp = value * 127 / 100;
-    mas_codec_writereg(MAS_REG_KMDB_HAR, (tmp & 0x7f) << 8);
+
+    audiohw_set_mdb_harmonics(value);
 }
 
 void sound_set_mdb_center(int value)
 {
     if(!audio_is_initialized)
         return;
-    mas_codec_writereg(MAS_REG_KMDB_FC, (value/10) << 8);
+
+    audiohw_set_mdb_center(value);
 }
 
 void sound_set_mdb_shape(int value)
 {
     if(!audio_is_initialized)
         return;
-    mdb_shape_shadow = (mdb_shape_shadow & 0x02) | ((value/10) << 8);
-    mas_codec_writereg(MAS_REG_KMDB_SWITCH, mdb_shape_shadow);
+
+    audiohw_set_mdb_shape(value);
 }
 
 void sound_set_mdb_enable(int value)
 {
     if(!audio_is_initialized)
         return;
-    mdb_shape_shadow = (mdb_shape_shadow & ~0x02) | (value?2:0);
-    mas_codec_writereg(MAS_REG_KMDB_SWITCH, mdb_shape_shadow);
+
+    audiohw_set_mdb_enable(value);
 }
 
 void sound_set_superbass(int value)
 {
     if(!audio_is_initialized)
         return;
-    loudness_shadow = (loudness_shadow & ~0x04) | (value?4:0);
-    mas_codec_writereg(MAS_REG_KLOUDNESS, loudness_shadow);
+
+    audiohw_set_superbass(value);
 }
 #endif /* (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F) */
 
@@ -847,11 +808,7 @@ void sound_set_pitch(int32_t pitch)
         /* Calculate the new (bogus) frequency */
         val = 18432 * PITCH_SPEED_100 / pitch;
 
-        mas_writemem(MAS_BANK_D0, MAS_D0_OFREQ_CONTROL, &val, 1);
-
-        /* We must tell the MAS that the frequency has changed.
-         * This will unfortunately cause a short silence. */
-        mas_writemem(MAS_BANK_D0, MAS_D0_IO_CONTROL_MAIN, &shadow_io_control_main, 1);
+        audiohw_set_pitch(val);
 
         last_pitch = pitch;
     }
diff --git a/firmware/mp3_playback.c b/firmware/target/sh/archos/audio-archos.c
similarity index 93%
rename from firmware/mp3_playback.c
rename to firmware/target/sh/archos/audio-archos.c
index 8e19829f56..e2d8b6f157 100644
--- a/firmware/mp3_playback.c
+++ b/firmware/target/sh/archos/audio-archos.c
@@ -28,12 +28,8 @@
 #include <kernel.h>
 #include "mp3_playback.h"
 #include "sound.h"
-#ifndef SIMULATOR
 #include "i2c.h"
-#include "mas.h"
-#include "dac.h"
 #include "system.h"
-#endif
 #include "audiohw.h"
 
 /* hacking into mpeg.c, recording is still there */
@@ -56,14 +52,12 @@ extern unsigned shadow_codec_reg0;
 static bool paused; /* playback is paused */
 static bool playing; /* We are playing an MP3 stream */
 
-#ifndef SIMULATOR
 /* for measuring the play time */
 static long playstart_tick;
 static long cumulative_ticks;
 
 /* the registered callback function to ask for more mp3 data */
 static void (*callback_for_more)(unsigned char**, size_t*);
-#endif /* #ifndef SIMULATOR */
 
 /* list of tracks in memory */
 #define MAX_ID3_TAGS (1<<4) /* Must be power of 2 */
@@ -77,8 +71,6 @@ bool audio_is_initialized = false;
 extern void playback_tick(void);
 extern void rec_tick(void);
 
-#ifndef SIMULATOR
-
 unsigned long mas_version_code;
 
 #if CONFIG_CODEC == MAS3507D
@@ -133,7 +125,6 @@ static void postpone_dma_tick(void)
 }
 #endif
 
-
 #if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F)
 void demand_irq_enable(bool on)
 {
@@ -328,7 +319,6 @@ static void init_playback(void)
     DEBUGF("MAS Decoding application started\n");
 }
 #endif /* #if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F) */
-#endif /* SIMULATOR */
 
 void mp3_init(int volume, int bass, int treble, int balance, int loudness,
               int avc, int channel_config, int stereo_width,
@@ -336,23 +326,6 @@ void mp3_init(int volume, int bass, int treble, int balance, int loudness,
               int mdb_center, int mdb_shape, bool mdb_enable,
               bool superbass)
 {
-#ifdef SIMULATOR
-    (void)volume;
-    (void)bass;
-    (void)treble;
-    (void)balance;
-    (void)loudness;
-    (void)avc;
-    (void)channel_config;
-    (void)stereo_width;
-    (void)mdb_strength;
-    (void)mdb_harmonics;
-    (void)mdb_center;
-    (void)mdb_shape;
-    (void)mdb_enable;
-    (void)superbass;
-    audio_is_initialized = true;
-#else
 #if CONFIG_CODEC == MAS3507D
     unsigned long val;
     (void)loudness;
@@ -469,7 +442,6 @@ void mp3_init(int volume, int bass, int treble, int balance, int loudness,
     sound_set(SOUND_MDB_ENABLE, mdb_enable);
     sound_set(SOUND_SUPERBASS, superbass);
 #endif
-#endif /* !SIMULATOR */
 
     playing = false;
     paused = true;
@@ -477,7 +449,6 @@ void mp3_init(int volume, int bass, int treble, int balance, int loudness,
 
 void mp3_shutdown(void)
 {
-#ifndef SIMULATOR
 #if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F)
     unsigned long val = 1;
     mas_writemem(MAS_BANK_D0, MAS_D0_SOFT_MUTE, &val, 1); /* Mute */
@@ -486,14 +457,10 @@ void mp3_shutdown(void)
 #if CONFIG_CODEC == MAS3507D
     dac_volume(0, 0, false);
 #endif
-
-#endif
 }
 
 /* new functions, to be exported to plugin API */
 
-#ifndef SIMULATOR
-
 void mp3_play_init(void)
 {
 #if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F)
@@ -594,25 +561,3 @@ unsigned char* mp3_get_pos(void)
 {
     return (unsigned char*)SAR3;
 }
-#else  /* #ifndef SIMULATOR */
-
-void mp3_play_pause(bool play)
-{
-    (void)play;
-}
-void mp3_play_stop(void)
-{
-}
-
-unsigned char* mp3_get_pos(void)
-{
-    return NULL;
-}
-
-void mp3_play_data(const unsigned char* start, int size,
-    void (*get_more)(unsigned char** start, size_t* size) /* callback fn */
-)
-{
-    (void)start; (void)size; (void)get_more;
-}
-#endif 
diff --git a/firmware/drivers/mas.c b/firmware/target/sh/archos/mascodec-archos.c
similarity index 99%
rename from firmware/drivers/mas.c
rename to firmware/target/sh/archos/mascodec-archos.c
index 4f384d3b98..3f932166eb 100644
--- a/firmware/drivers/mas.c
+++ b/firmware/target/sh/archos/mascodec-archos.c
@@ -5,7 +5,7 @@
  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
  *                     \/            \/     \/    \/            \/
- * $Id$
+ * $Id: mas.c 18807 2008-10-14 11:12:20Z zagor $
  *
  * Copyright (C) 2002 by Linus Nielsen Feltzing
  *
@@ -23,7 +23,7 @@
 #include "sh7034.h"
 #include "i2c.h"
 #include "debug.h"
-#include "mas.h"
+#include "mas35xx.h"
 #include "kernel.h"
 #include "system.h"
 #include "hwcompat.h"
diff --git a/firmware/test/i2c/main.c b/firmware/test/i2c/main.c
index ad0f8efcbd..7a2ff49fcb 100644
--- a/firmware/test/i2c/main.c
+++ b/firmware/test/i2c/main.c
@@ -46,9 +46,9 @@
 
 #include "i2c.h"
 
-#include "mas.h"
+#include "mas35xx.h"
 
-#include "dac.h"
+#include "dac3550a.h"
 
 #include "sh7034.h"
 
diff --git a/uisimulator/common/stubs.c b/uisimulator/common/stubs.c
index a9011b9aa5..e0372d2683 100644
--- a/uisimulator/common/stubs.c
+++ b/uisimulator/common/stubs.c
@@ -40,7 +40,113 @@ void audio_set_buffer_margin(int seconds)
 {
      (void)seconds;
 }
-#endif
+
+/* firmware/target/sh/archos/audio-archos.c */
+
+/* list of tracks in memory */
+#define MAX_ID3_TAGS (1<<4) /* Must be power of 2 */
+#define MAX_ID3_TAGS_MASK (MAX_ID3_TAGS - 1)
+
+static bool paused; /* playback is paused */
+static bool playing; /* We are playing an MP3 stream */
+
+bool audio_is_initialized = false;
+
+void mp3_init(int volume, int bass, int treble, int balance, int loudness,
+              int avc, int channel_config, int stereo_width,
+              int mdb_strength, int mdb_harmonics,
+              int mdb_center, int mdb_shape, bool mdb_enable,
+              bool superbass)
+{
+    (void)volume;
+    (void)bass;
+    (void)treble;
+    (void)balance;
+    (void)loudness;
+    (void)avc;
+    (void)channel_config;
+    (void)stereo_width;
+    (void)mdb_strength;
+    (void)mdb_harmonics;
+    (void)mdb_center;
+    (void)mdb_shape;
+    (void)mdb_enable;
+    (void)superbass;
+    audio_is_initialized = true;
+
+    playing = false;
+    paused = true;
+}
+
+void mp3_play_pause(bool play)
+{
+    (void)play;
+}
+
+void mp3_play_stop(void)
+{
+}
+
+unsigned char* mp3_get_pos(void)
+{
+    return NULL;
+}
+
+void mp3_play_data(const unsigned char* start, int size,
+    void (*get_more)(unsigned char** start, size_t* size) /* callback fn */
+)
+{
+    (void)start; (void)size; (void)get_more;
+}
+
+/* firmware/drivers/audio/mas35xx.c */
+#if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F)
+void audiohw_set_loudness(int value)
+{
+    (void)value;
+}
+
+void audiohw_set_avc(int value)
+{
+    (void)value;
+}
+
+void audiohw_set_mdb_strength(int value)
+{
+    (void)value;
+}
+
+void audiohw_set_mdb_harmonics(int value)
+{
+    (void)value;
+}
+
+void audiohw_set_mdb_center(int value)
+{
+    (void)value;
+}
+
+void audiohw_set_mdb_shape(int value)
+{
+    (void)value;
+}
+
+void audiohw_set_mdb_enable(int value)
+{
+    (void)value;
+}
+
+void audiohw_set_superbass(int value)
+{
+    (void)value;
+}
+
+void audiohw_set_pitch(unsigned long value)
+{
+    (void)value;
+}
+#endif /* (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F) */
+#endif /* CODEC != SWCODEC */
 
 int fat_startsector(void)
 {