Manual section for the pitch detector (this is just the beginning)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22667 a1c6a512-1295-4272-9138-f99709370657

apps/features.txt

@@ -132,6 +132,12 @@ recording_swcodec
 #else
 recording_hwcodec
 #endif
+#if defined(HAVE_LINE_IN)
+recording_linein
+#endif
+#if defined(HAVE_MIC_IN)
+recording_mic
+#endif
 #endif
 
 #if defined(HAVE_REMOTE_LCD)

manual/plugins/main.tex

@@ -185,6 +185,8 @@ the associated file. Viewers are stored in the
 
 {\input{plugins/metronome.tex}}
 
+\opt{swcodec}{\opt{recording_mic}{\input{plugins/pitch_detector.tex}}}
+
 {\input{plugins/random_folder_advance_config.tex}}
 
 \opt{lcd_color}{\input{plugins/rockpaint.tex}}

manual/plugins/pitch_detector.tex

@@ -0,0 +1,8 @@
+% $Id$ %
+
+\subsection{Pitch Detector}
+
+With the Pitch Detector, you can play a note on a musical instrument,
+and the plugin will tell you what note it is (e.g. A, A\#, B, etc.) The
+frequency will also be displayed. This may be a great assistance when
+tuning a musical instrument.