diff -ruN alsa-lib-1.0.10rc3.orig/src/pcm/pcm_iec958.c alsa-lib-1.0.10rc3/src/pcm/pcm_iec958.c
--- alsa-lib-1.0.10rc3.orig/src/pcm/pcm_iec958.c	2005-05-24 16:14:35.000000000 +0200
+++ alsa-lib-1.0.10rc3/src/pcm/pcm_iec958.c	2005-11-16 01:35:46.000000000 +0100
@@ -116,10 +116,10 @@
 		data |= 0x80000000;
 
 	/* Preamble */
-	if (! iec->counter)
-		data |= iec->preamble[PREAMBLE_Z];	/* Block start, 'Z' */
-	else if (! channel)
+	if (channel)
 		data |= iec->preamble[PREAMBLE_Y];	/* odd sub frame, 'Y' */
+	else if (! iec->counter)
+		data |= iec->preamble[PREAMBLE_Z];	/* Block start, 'Z' */
 	else
 		data |= iec->preamble[PREAMBLE_X];	/* even sub frame, 'X' */