Index: uspace/drv/audio/sb16/dsp.c
===================================================================
--- uspace/drv/audio/sb16/dsp.c	(revision ac07a135a994b4d0c0d2cd8a758efe93ebc3b579)
+++ uspace/drv/audio/sb16/dsp.c	(revision 84d6c398099386d87d2e1c9445fdc2cef511df03)
@@ -148,5 +148,8 @@
 static inline size_t sample_count(uint8_t mode, size_t byte_count)
 {
-	if (mode & DSP_MODE_16BIT) {
+	// FIXME we only support 16 bit playback for now.
+	return byte_count / 2;
+
+	if (mode & DSP_MODE_SIGNED) {
 		return byte_count / 2;
 	}
@@ -256,5 +259,5 @@
 
 	/* Check supported parameters */
-	if (sample_size != 8 && sample_size != 16)
+	if (sample_size != 16) // FIXME We only support 16 bit playback
 		return ENOTSUP;
 	if (channels != 1 && channels != 2)
@@ -275,6 +278,5 @@
 	dsp->playing.mode = 0;
 
-	if (sample_size == 16)
-		dsp->playing.mode |= DSP_MODE_16BIT;
+		dsp->playing.mode |= DSP_MODE_SIGNED;
 	if (channels == 2)
 		dsp->playing.mode |= DSP_MODE_STEREO;
Index: uspace/drv/audio/sb16/dsp_commands.h
===================================================================
--- uspace/drv/audio/sb16/dsp_commands.h	(revision ac07a135a994b4d0c0d2cd8a758efe93ebc3b579)
+++ uspace/drv/audio/sb16/dsp_commands.h	(revision 84d6c398099386d87d2e1c9445fdc2cef511df03)
@@ -142,8 +142,8 @@
 	SINGLE_DMA_16B_DA = 0xb0,     /* Followed by mode, size.low, size.high*/
 	SINGLE_DMA_16B_DA_FIFO = 0xb2,/* mode format is:                      */
-	AUTO_DMA_16B_DA = 0xb4,       /*    0x00 - unsigned mono 8bit         */
-	AUTO_DMA_16B_DA_FIFO = 0xb6,  /*    0x10 - signed mono 16bit          */
-	SINGLE_DMA_16B_AD = 0xb8,     /*    0x20 - unsigned stereo 8bit       */
-	SINGLE_DMA_16B_AD_FIFO = 0xba,/*    0x30 - signed stereo 16bit        */
+	AUTO_DMA_16B_DA = 0xb4,       /*    0x00 - unsigned mono              */
+	AUTO_DMA_16B_DA_FIFO = 0xb6,  /*    0x10 - signed mono                */
+	SINGLE_DMA_16B_AD = 0xb8,     /*    0x20 - unsigned stereo            */
+	SINGLE_DMA_16B_AD_FIFO = 0xba,/*    0x30 - signed stereo              */
 	AUTO_DMA_16B_AD = 0xbc,       /* Size is -1. Terminate by EXIT        */
 	AUTO_DMA_16B_AD_FIFO = 0xbe,  /* or switch to SINGLE_DMA              */
@@ -151,8 +151,8 @@
 	SINGLE_DMA_8B_DA = 0xc0,     /* Followed by mode, size.low, size.high */
 	SINGLE_DMA_8B_DA_FIFO = 0xc2,/* mode format is:                       */
-	AUTO_DMA_8B_DA = 0xc4,       /*    0x00 - unsigned mono 8bit          */
-	AUTO_DMA_8B_DA_FIFO = 0xc6,  /*    0x10 - signed mono 16bit           */
-	SINGLE_DMA_8B_AD = 0xc8,     /*    0x20 - unsigned stereo 8bit        */
-	SINGLE_DMA_8B_AD_FIFO = 0xca,/*    0x30 - signed stereo 16bit         */
+	AUTO_DMA_8B_DA = 0xc4,       /*    0x00 - unsigned mono               */
+	AUTO_DMA_8B_DA_FIFO = 0xc6,  /*    0x10 - signed mono                 */
+	SINGLE_DMA_8B_AD = 0xc8,     /*    0x20 - unsigned stereo             */
+	SINGLE_DMA_8B_AD_FIFO = 0xca,/*    0x30 - signed stereo               */
 	AUTO_DMA_8B_AD = 0xcc,       /* Size is -1. Terminate by EXIT         */
 	AUTO_DMA_8B_AD_FIFO = 0xce,  /* or switch to SINGLE_DMA               */
@@ -163,5 +163,5 @@
 } dsp_command_t;
 /*----------------------------------------------------------------------------*/
-#define DSP_MODE_16BIT 0x10
+#define DSP_MODE_SIGNED 0x10
 #define DSP_MODE_STEREO 0x20