diff --git a/static/qrplay/v3d.html b/static/qrplay/v3d.html
index 5bb976e..f7a8172 100644
--- a/static/qrplay/v3d.html
+++ b/static/qrplay/v3d.html
@@ -44,7 +44,7 @@ M=_=>{
 	// next index into S
 	s=1;
 	// opcode
-	z='\n;+-@.3cdefgabxjtsiqhwmuv{}012456789'.indexOf(a);
+	z='\n;+-@.3cdefgabxjtsiqhwmuv{}z012456789'.indexOf(a);
 
 	// do nothing
 	z<0?0:
@@ -78,8 +78,9 @@ M=_=>{
 	// change volume
 	z<25?(V=b+c,s+=2):
 	// play simultaneously
-	z<26?B[Z++]={L,O,T,U,V}:
-	z<27?{L,O,T,U,V}=B[--Z]:
+	z<26?B[Z++]=[L,O,T,U,V]:z<27?[L,O,T,U,V]=B[--Z]:
+	// play on channel
+	z<28?B[B[Z]=[L,O,T,U,V],s=3,Z=b+c]=[L,O,T,U,V]=[1,0,0,U,V]:
 	// store sample
 	b=='['?(
 		m=0,
@@ -95,6 +96,6 @@ M=_=>{
 	S=C[a]+S.slice(s--);
 	
 	// loop (but don't get too far ahead)
-	A.state!='closed'&&(S=S.slice(s))&&setTimeout(M,1e3*T-Date.now()+D);
+	A.state!='closed'&&(S=S.slice(s))&&setTimeout(M,1e3*T-Date.now()+D-5e3);
 };M()
 ">#play</BUTTON> <BUTTON ONCLICK=F.A.close()>#stop