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diff --git a/sys/dev/sound/pcm/channel.h b/sys/dev/sound/pcm/channel.h
--- a/sys/dev/sound/pcm/channel.h
+++ b/sys/dev/sound/pcm/channel.h
@@ -405,11 +405,8 @@
-#define CHN_N_RATE 0x00000001
-#define CHN_N_FORMAT 0x00000002
-#define CHN_N_VOLUME 0x00000004
-#define CHN_N_BLOCKSIZE 0x00000008
-#define CHN_N_TRIGGER 0x00000010
+#define CHN_N_BLOCKSIZE 0x00000001
+#define CHN_N_TRIGGER 0x00000002
#define CHN_LATENCY_MIN 0
#define CHN_LATENCY_MAX 10
diff --git a/sys/dev/sound/pcm/channel.c b/sys/dev/sound/pcm/channel.c
--- a/sys/dev/sound/pcm/channel.c
+++ b/sys/dev/sound/pcm/channel.c
@@ -2351,31 +2351,7 @@
*/
run = (CHN_STARTED(c)) ? 1 : 0;
if (run)
- flags &= CHN_N_VOLUME | CHN_N_TRIGGER;
-
- if (flags & CHN_N_RATE) {
- /*
- * XXX I'll make good use of this someday.
- * However this is currently being superseded by
- * the availability of CHN_F_VCHAN_DYNAMIC.
- */
- }
-
- if (flags & CHN_N_FORMAT) {
- /*
- * XXX I'll make good use of this someday.
- * However this is currently being superseded by
- * the availability of CHN_F_VCHAN_DYNAMIC.
- */
- }
-
- if (flags & CHN_N_VOLUME) {
- /*
- * XXX I'll make good use of this someday, though
- * soft volume control is currently pretty much
- * integrated.
- */
- }
+ flags &= CHN_N_TRIGGER;
if (flags & CHN_N_BLOCKSIZE) {
/*

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