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Index: firmware/export/audiohw.h===================================================================--- firmware/export/audiohw.h	(revision 29594)+++ firmware/export/audiohw.h	(working copy)@@ -338,6 +338,7 @@     SOUND_CHAN_MONO_LEFT,     SOUND_CHAN_MONO_RIGHT,     SOUND_CHAN_KARAOKE,+    SOUND_CHAN_SWAP,     SOUND_CHAN_NUM_MODES, }; Index: apps/lang/english.lang===================================================================--- apps/lang/english.lang	(revision 29594)+++ apps/lang/english.lang	(working copy)@@ -12744,3 +12744,20 @@     *: "In custom directories only"   </voice> </phrase>+<phrase>+  id: LANG_CHANNEL_SWAP+  desc: in sound_settings+  user: core+  <source>+    *: none+    swcodec: "Swap channels"+  </source>+  <dest>+    *: none+    swcodec: "Swap channels"+  </dest>+  <voice>+    *: none+    swcodec: "Swap channels"+  </voice>+</phrase>Index: apps/dsp.c===================================================================--- apps/dsp.c	(revision 29594)+++ apps/dsp.c	(working copy)@@ -1116,6 +1116,18 @@ } #endif /* DSP_HAVE_ASM_SOUND_CHAN_KARAOKE */ +static void channels_process_sound_chan_swap(int count, int32_t *buf[])+{+    int32_t *sl = buf[0], *sr = buf[1];++    while (count-- > 0)+    {+        int32_t ch = *sl;+        *sl++ = *sr;+        *sr++ = ch;+    }+}+ static void dsp_set_channel_config(int value) {     static const channels_process_fn_type channels_process_functions[] =@@ -1127,6 +1139,7 @@         [SOUND_CHAN_MONO_LEFT]  = channels_process_sound_chan_mono_left,         [SOUND_CHAN_MONO_RIGHT] = channels_process_sound_chan_mono_right,         [SOUND_CHAN_KARAOKE]    = channels_process_sound_chan_karaoke,+        [SOUND_CHAN_SWAP]       = channels_process_sound_chan_swap,     };      if ((unsigned)value >= ARRAYLEN(channels_process_functions) ||Index: apps/settings_list.c===================================================================--- apps/settings_list.c	(revision 29594)+++ apps/settings_list.c	(working copy)@@ -639,11 +639,12 @@      CHOICE_SETTING(F_SOUNDSETTING, channel_config, LANG_CHANNEL_CONFIGURATION,                    0,"channels",-                   "stereo,mono,custom,mono left,mono right,karaoke",-                   sound_set_channels, 6,+                   "stereo,mono,custom,mono left,mono right,karaoke,swap",+                   sound_set_channels, 7,                    ID2P(LANG_CHANNEL_STEREO), ID2P(LANG_CHANNEL_MONO),                    ID2P(LANG_CHANNEL_CUSTOM), ID2P(LANG_CHANNEL_LEFT),-                   ID2P(LANG_CHANNEL_RIGHT), ID2P(LANG_CHANNEL_KARAOKE)),+                   ID2P(LANG_CHANNEL_RIGHT), ID2P(LANG_CHANNEL_KARAOKE),+                   ID2P(LANG_CHANNEL_SWAP)),     SOUND_SETTING(F_SOUNDSETTING, stereo_width, LANG_STEREO_WIDTH,                   "stereo_width", SOUND_STEREO_WIDTH), #ifdef AUDIOHW_HAVE_DEPTH_3D