merge in jb-mr2-release history after reset to master
diff --git a/include/system/audio.h b/include/system/audio.h
index d246070..da235dd 100644
--- a/include/system/audio.h
+++ b/include/system/audio.h
@@ -239,6 +239,7 @@
AUDIO_CHANNEL_IN_MONO = AUDIO_CHANNEL_IN_FRONT,
AUDIO_CHANNEL_IN_STEREO = (AUDIO_CHANNEL_IN_LEFT | AUDIO_CHANNEL_IN_RIGHT),
+ AUDIO_CHANNEL_IN_FRONT_BACK = (AUDIO_CHANNEL_IN_FRONT | AUDIO_CHANNEL_IN_BACK),
AUDIO_CHANNEL_IN_ALL = (AUDIO_CHANNEL_IN_LEFT |
AUDIO_CHANNEL_IN_RIGHT |
AUDIO_CHANNEL_IN_FRONT |