diff --git a/sys/dev/pcm/isa/sb.c b/sys/dev/pcm/isa/sb.c
index ed9225f800c..e786f5f430b 100644
--- a/sys/dev/pcm/isa/sb.c
+++ b/sys/dev/pcm/isa/sb.c
@@ -419,7 +419,7 @@ sb_callback(snddev_info *d, int reason)
 	break;
 
     case SND_CB_STOP :
-	/* sb_cmd(d->io_base, DSP_CMD_SPKOFF); /* speaker off */
+	/* XXX ??? sb_cmd(d->io_base, DSP_CMD_SPKOFF);*/ /* speaker off */
 	break ;
 
     }
diff --git a/sys/dev/sound/isa/sb.c b/sys/dev/sound/isa/sb.c
index ed9225f800c..e786f5f430b 100644
--- a/sys/dev/sound/isa/sb.c
+++ b/sys/dev/sound/isa/sb.c
@@ -419,7 +419,7 @@ sb_callback(snddev_info *d, int reason)
 	break;
 
     case SND_CB_STOP :
-	/* sb_cmd(d->io_base, DSP_CMD_SPKOFF); /* speaker off */
+	/* XXX ??? sb_cmd(d->io_base, DSP_CMD_SPKOFF);*/ /* speaker off */
 	break ;
 
     }
diff --git a/sys/dev/sound/isa/sb16.c b/sys/dev/sound/isa/sb16.c
index ed9225f800c..e786f5f430b 100644
--- a/sys/dev/sound/isa/sb16.c
+++ b/sys/dev/sound/isa/sb16.c
@@ -419,7 +419,7 @@ sb_callback(snddev_info *d, int reason)
 	break;
 
     case SND_CB_STOP :
-	/* sb_cmd(d->io_base, DSP_CMD_SPKOFF); /* speaker off */
+	/* XXX ??? sb_cmd(d->io_base, DSP_CMD_SPKOFF);*/ /* speaker off */
 	break ;
 
     }
diff --git a/sys/dev/sound/isa/sb8.c b/sys/dev/sound/isa/sb8.c
index ed9225f800c..e786f5f430b 100644
--- a/sys/dev/sound/isa/sb8.c
+++ b/sys/dev/sound/isa/sb8.c
@@ -419,7 +419,7 @@ sb_callback(snddev_info *d, int reason)
 	break;
 
     case SND_CB_STOP :
-	/* sb_cmd(d->io_base, DSP_CMD_SPKOFF); /* speaker off */
+	/* XXX ??? sb_cmd(d->io_base, DSP_CMD_SPKOFF);*/ /* speaker off */
 	break ;
 
     }
diff --git a/sys/i386/isa/snd/sb_dsp.c b/sys/i386/isa/snd/sb_dsp.c
index ed9225f800c..e786f5f430b 100644
--- a/sys/i386/isa/snd/sb_dsp.c
+++ b/sys/i386/isa/snd/sb_dsp.c
@@ -419,7 +419,7 @@ sb_callback(snddev_info *d, int reason)
 	break;
 
     case SND_CB_STOP :
-	/* sb_cmd(d->io_base, DSP_CMD_SPKOFF); /* speaker off */
+	/* XXX ??? sb_cmd(d->io_base, DSP_CMD_SPKOFF);*/ /* speaker off */
 	break ;
 
     }