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-rw-r--r--include/uapi/sound/emu10k1.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/uapi/sound/emu10k1.h b/include/uapi/sound/emu10k1.h
index c2414bd5aecd..33e5228f5d8c 100644
--- a/include/uapi/sound/emu10k1.h
+++ b/include/uapi/sound/emu10k1.h
@@ -111,6 +111,9 @@
#define CC_REG_NONZERO C_00000100
/* FX buses */
+// These are arbitrary mappings; our DSP code simply expects
+// the config files to route the channels this way.
+// The numbers are documented in {audigy,sb-live}-mixer.rst.
#define FXBUS_PCM_LEFT 0x00
#define FXBUS_PCM_RIGHT 0x01
#define FXBUS_PCM_LEFT_REAR 0x02