Fill new software buffers with silence.

dlls/dsound/buffer.c

@@ -1105,6 +1105,7 @@ HRESULT WINAPI IDirectSoundBufferImpl_Create(
 			return DSERR_OUTOFMEMORY;
 		}
 		dsb->buffer->ref = 1;
+		FillMemory(dsb->buffer->memory, dsb->buflen, dsbd->lpwfxFormat->wBitsPerSample == 8 ? 128 : 0);
 	}
 
 	/* Allocate the hardware buffer */
@@ -1136,6 +1137,7 @@ HRESULT WINAPI IDirectSoundBufferImpl_Create(
 					return DSERR_OUTOFMEMORY;
 				}
 				dsb->buffer->ref = 1;
+				FillMemory(dsb->buffer->memory, dsb->buflen, dsbd->lpwfxFormat->wBitsPerSample == 8 ? 128 : 0);
 			}
 			err = DS_OK;
 		}

dlls/dsound/primary.c

@@ -114,7 +114,7 @@ static HRESULT DSOUND_PrimaryOpen(IDirectSoundImpl *This)
 			This->pwqueue = 0;
 			This->playpos = 0;
 			This->mixpos = 0;
-			FillMemory(This->buffer, This->buflen, (This->pwfx->wBitsPerSample == 16) ? 0 : 128);
+			FillMemory(This->buffer, This->buflen, (This->pwfx->wBitsPerSample == 8) ? 128 : 0);
 			TRACE("fraglen=%ld\n", This->fraglen);
 			DSOUND_WaveQueue(This, (DWORD)-1);
 		}