diff --git a/afsk/main.c b/afsk/main.c
index 0970d0f8..3b840b50 100644
--- a/afsk/main.c
+++ b/afsk/main.c
@@ -764,7 +764,7 @@ int get_tlm_fox() {
 // 	for (i = 1; i <= SYNC_BITS * SAMPLES; i++)
  	for (i = 1; i <= syncBits * samples; i++)
 	{
-		write_wave(ctr, buffer);	
+		write_wave(ctr, buffer[alt]);	
 //		if ( (i % SAMPLES) == 0) {
 		if ( (i % samples) == 0) {
 //  			int bit = SYNC_BITS - i/SAMPLES + 1;