diff --git a/sys/i386/isa/sound/sb16_dsp.c b/sys/i386/isa/sound/sb16_dsp.c
index 1e94e152902..ad9be54032c 100644
--- a/sys/i386/isa/sound/sb16_dsp.c
+++ b/sys/i386/isa/sound/sb16_dsp.c
@@ -48,6 +48,8 @@ static int      dsp_stereo = 0;
 static int      dsp_current_speed = 8000;
 static int      dsp_busy = 0;
 static int      dma16, dma8;
+
+
 static int      trigger_bits = 0;
 static u_long dsp_count = 0;
 
@@ -198,6 +200,7 @@ sb16_dsp_open(int dev, int mode)
     int             retval;
 
     DEB(printf("sb16_dsp_open()\n"));
+
     if (!sb16_dsp_ok) {
 	printf("SB16 Error: SoundBlaster board not installed\n");
 	return -(ENXIO);
@@ -207,6 +210,7 @@ sb16_dsp_open(int dev, int mode)
 
     sb_reset_dsp();
 
+
     irq_mode = IMODE_NONE;
     dsp_busy = 1;
     trigger_bits = 0;
@@ -229,6 +233,8 @@ sb16_dsp_close(int dev)
 
     dsp_cleanup();
     dsp_busy = 0;
+
+
     splx(flags);
 }
 
@@ -237,10 +243,12 @@ sb16_dsp_output_block(int dev, u_long buf, int count, int intrflag, int dma_rest
 {
     u_long   flags, cnt;
 
+
     cnt = count;
     if (dsp_16bit)
 	cnt >>= 1;
     cnt--;
+
     if (audio_devs[dev]->flags & DMA_AUTOMODE && intrflag && cnt==dsp_count) {
 	irq_mode = IMODE_OUTPUT;
 	intr_active = 1;
@@ -309,7 +317,20 @@ sb16_dsp_start_input(int dev, u_long buf, int count, int intrflag, int dma_resta
 static int
 sb16_dsp_prepare_for_input(int dev, int bsize, int bcount)
 {
+    int fudge;
+    struct dma_buffparms *dmap =  audio_devs[dev]->dmap_in;
+
     audio_devs[my_dev]->dmachan2 = dsp_16bit ? dma16 : dma8;
+
+
+    fudge =  audio_devs[my_dev]->dmachan2 ;
+
+    if (dmap->dma_chan != fudge ) {
+      isa_dma_release( dmap->dma_chan);
+      isa_dma_acquire(fudge);
+      dmap->dma_chan = fudge;
+    }
+
     dsp_count = 0;
     dsp_cleanup();
     if (dsp_16bit) 
@@ -325,11 +346,16 @@ static int
 sb16_dsp_prepare_for_output(int dev, int bsize, int bcount)
 {
     int fudge = dsp_16bit ? dma16 : dma8;
+    struct dma_buffparms *dmap =  audio_devs[dev]->dmap_out;
 
-    isa_dma_release( audio_devs[my_dev]->dmachan1 );
-    isa_dma_acquire(fudge);
+    if (dmap->dma_chan != fudge ) {
+      isa_dma_release( dmap->dma_chan);
+      isa_dma_acquire(fudge);
+      dmap->dma_chan = fudge;
+    }
 
     audio_devs[my_dev]->dmachan1 = fudge;
+
     dsp_count = 0;
     dsp_cleanup();
     if (dsp_16bit) 
diff --git a/sys/i386/isa/sound/sb_dsp.c b/sys/i386/isa/sound/sb_dsp.c
index 67c66f76585..47e93b22008 100644
--- a/sys/i386/isa/sound/sb_dsp.c
+++ b/sys/i386/isa/sound/sb_dsp.c
@@ -50,6 +50,8 @@
  * variables are put in a struct sb_unit[] array
  */
 
+
+
 int             sbc_base = 0;
 int             sbc_irq = 0;
 static int      open_mode = 0;	/* Read, write or both */
@@ -231,7 +233,6 @@ dsp_speed(int speed)
     u_long   flags;
     int             max_speed = 44100;
 
-printf("dsp_speed %d\n", speed); /* XXX lr 970601 */
     if (speed < 4000)
 	    speed = 4000;
 
@@ -310,7 +311,6 @@ printf("dsp_speed %d\n", speed); /* XXX lr 970601 */
 	speed /= 2;
 
     dsp_current_speed = speed;
-printf("dsp_speed done %d\n", speed);
     return speed;
 }
 
@@ -445,6 +445,9 @@ dsp_cleanup(void)
 static int
 sb_dsp_prepare_for_input(int dev, int bsize, int bcount)
 {
+    int fudge = -1;
+    struct dma_buffparms *dmap =  audio_devs[dev]->dmap_in;
+
     dsp_cleanup();
     dsp_speaker(OFF);
 
@@ -470,6 +473,14 @@ sb_dsp_prepare_for_input(int dev, int bsize, int bcount)
 	dsp_speed(dsp_current_speed);	/* Speed must be recalculated
 					 * if #channels * changes */
     }
+
+    fudge = audio_devs[my_dev]->dmachan1;
+    if (dmap->dma_chan != fudge ) {
+      isa_dma_release( dmap->dma_chan);
+      isa_dma_acquire(fudge);
+      dmap->dma_chan = fudge;
+    }
+
     trigger_bits = 0;
     sb_dsp_command(DSP_CMD_DMAHALT);	/* Halt DMA */
     return 0;
@@ -478,6 +489,10 @@ sb_dsp_prepare_for_input(int dev, int bsize, int bcount)
 static int
 sb_dsp_prepare_for_output(int dev, int bsize, int bcount)
 {
+
+    int fudge;
+    struct dma_buffparms *dmap =  audio_devs[dev]->dmap_out;
+
     dsp_cleanup();
     dsp_speaker(ON);
 
@@ -488,6 +503,7 @@ sb_dsp_prepare_for_output(int dev, int bsize, int bcount)
 	 * 16 bit specific instructions
 	 */
 	audio_devs[my_dev]->dmachan1 = dsp_16bit ? dma16 : dma8;
+
 	if (Jazz16_detected != 2)	/* SM Wave */
 	    sb_mixer_set_stereo(dsp_stereo);
 	if (dsp_stereo)
@@ -501,6 +517,14 @@ sb_dsp_prepare_for_output(int dev, int bsize, int bcount)
 					 * if #channels * changes */
     }
 #endif
+    fudge = audio_devs[my_dev]->dmachan1;
+
+    if (dmap->dma_chan != fudge ) {
+      isa_dma_release( dmap->dma_chan);
+      isa_dma_acquire(fudge);
+      dmap->dma_chan = fudge;
+    }
+
     trigger_bits = 0;
     sb_dsp_command(DSP_CMD_DMAHALT);	/* Halt DMA */
     return 0;
@@ -548,6 +572,7 @@ sb_dsp_open(int dev, int mode)
     sb_dsp_busy = 1;
     open_mode = mode;
 
+
     return 0;
 }
 
@@ -569,6 +594,7 @@ sb_dsp_close(int dev)
     sb_dsp_busy = 0;
     sb_dsp_highspeed = 0;
     open_mode = 0;
+
 }
 
 #ifdef JAZZ16