diff --git a/sid.4th b/sid.4th
index 11a2a29..b66edc1 100644
--- a/sid.4th
+++ b/sid.4th
@@ -8,8 +8,8 @@
 
 \ Voice control register flags
 : SID:CTL:GATE  1 ;
-: SID:CTL:SYNC3 2 ;
-: SID:CTL:RING3 4 ;
+: SID:CTL:SYNC  2 ;
+: SID:CTL:RING  4 ;
 : SID:CTL:TEST  8 ;
 : SID:CTL:TRI   16 ;
 : SID:CTL:SAW   32 ;