diff --git a/sys/conf/NOTES b/sys/conf/NOTES
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -2175,15 +2175,11 @@
 #                              integer/arithmetic. Slight increase of dynamic
 #                              range at a cost of possible slowdown.
 #
-# SND_OLDSTEREO                Only 2 channels are allowed, effectively
-#                              disabling multichannel processing.
-#
 options 	SND_DIAGNOSTIC
 options 	SND_FEEDER_MULTIFORMAT
 options 	SND_FEEDER_FULL_MULTIFORMAT
 options 	SND_FEEDER_RATE_HP
 options 	SND_PCM_64
-options 	SND_OLDSTEREO
 
 #
 # Cardbus
diff --git a/sys/conf/options b/sys/conf/options
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -920,7 +920,6 @@
 SND_FEEDER_FULL_MULTIFORMAT	opt_snd.h
 SND_FEEDER_RATE_HP	opt_snd.h
 SND_PCM_64		opt_snd.h
-SND_OLDSTEREO		opt_snd.h
 
 X86BIOS
 
diff --git a/sys/dev/sound/pcm/matrix.h b/sys/dev/sound/pcm/matrix.h
--- a/sys/dev/sound/pcm/matrix.h
+++ b/sys/dev/sound/pcm/matrix.h
@@ -29,10 +29,7 @@
 #ifndef _SND_MATRIX_H_
 #define _SND_MATRIX_H_
 
-#undef SND_MULTICHANNEL
-#ifndef SND_OLDSTEREO
 #define SND_MULTICHANNEL	1
-#endif
 
 /*
  * XXX = unused, but part of the definition (will be used someday, maybe).