diff --git a/static/abc/index.html b/static/abc/index.html
index d31404b..c6443c2 100644
--- a/static/abc/index.html
+++ b/static/abc/index.html
@@ -9,16 +9,20 @@
 @i+ge!dc-ge!dh.c
 </textarea><br>
 <button onclick="
-A=new AudioContext();
+const A=new AudioContext();
 // tempo
 r=.4;
+e='exponentialRampToValueAtTime';
 // play note with pitch and duration
 p=(h,t,u)=>{
   a=A.createOscillator();
-  a.connect(A.destination);
+  const b=A.createGain();
+  a.connect(b);
+  b.connect(A.destination);
   a.frequency.value=h;
   a.start(t*r);
-  a.stop(u*r);
+  b.gain[e](1,t*r+.1);
+  b.gain[e](0.001,u*r);
 };
 // read text from input
 v=window.location.search.slice(1)||f.value;f.value=v;