diff --git a/repl/src/App.tsx b/repl/src/App.tsx
index 375e29cd..d894ce69 100644
--- a/repl/src/App.tsx
+++ b/repl/src/App.tsx
@@ -4,16 +4,17 @@ import cx from './cx';
 import * as Tone from 'tone';
 import useCycle from './useCycle';
 import type { Pattern } from './types';
-import * as tunes from './tunes';
+import defaultTune from './tunes';
 import * as parser from './parse';
 import CodeMirror from './CodeMirror';
 import hot from '../public/hot';
 import { isNote } from 'tone';
 import { useWebMidi } from './midi';
-
-const { tetris, tetrisRev, shapeShifted } = tunes;
 const { parse } = parser;
 
+const [_, codeParam] = window.location.href.split('#');
+const decoded = atob(codeParam || '');
+
 const getHotCode = async () => {
   return fetch('/hot.js')
     .then((res) => res.text())
@@ -32,12 +33,17 @@ defaultSynth.set({
 
 function App() {
   const [mode, setMode] = useState<string>('javascript');
-  const [code, setCode] = useState<string>(shapeShifted);
+  const [code, setCode] = useState<string>(decoded || defaultTune);
   const [log, setLog] = useState('');
   const logBox = useRef<any>();
   const [error, setError] = useState<Error>();
   const [pattern, setPattern] = useState<Pattern>();
   const [activePattern, setActivePattern] = useState<Pattern>();
+  const activatePattern = (_pattern = pattern) => {
+    setActivePattern(() => _pattern);
+    window.location.hash = '#' + btoa(code);
+    !cycle.started && cycle.start();
+  };
   const [isHot, setIsHot] = useState(false); // set to true to enable live coding in hot.js, using dev server
   const pushLog = (message: string) => setLog((log) => log + `${log ? '\n\n' : ''}${message}`);
   // logs events of cycle
@@ -86,8 +92,7 @@ function App() {
   useLayoutEffect(() => {
     const handleKeyPress = (e: any) => {
       if (e.ctrlKey && e.code === 'Enter') {
-        setActivePattern(() => pattern);
-        !cycle.started && cycle.start();
+        activatePattern();
       }
     };
     document.addEventListener('keypress', handleKeyPress);
@@ -104,7 +109,7 @@ function App() {
           setCode(_code);
           setMode('javascript');
         }); // if using HMR, just use changed file
-        setActivePattern(hot);
+        activatePattern(hot);
         return;
       } else {
         _code = hot;
@@ -117,8 +122,8 @@ function App() {
       // need arrow function here! otherwise if user returns a function, react will think it's a state reducer
       // only first time, then need ctrl+enter
       setPattern(() => parsed.pattern);
-      if (!activePattern || isHot) {
-        setActivePattern(() => parsed.pattern);
+      if (isHot) {
+        activatePattern(parsed.pattern);
       }
       setMode(parsed.mode);
       setError(undefined);
@@ -196,7 +201,13 @@ function App() {
         </div>
         <button
           className="flex-none w-full border border-gray-700 p-2 bg-slate-700 hover:bg-slate-500"
-          onClick={() => cycle.toggle()}
+          onClick={() => {
+            if (!cycle.started) {
+              activatePattern();
+            } else {
+              cycle.stop();
+            }
+          }}
         >
           {cycle.started ? 'pause' : 'play'}
         </button>
diff --git a/repl/src/midi.ts b/repl/src/midi.ts
index d27165b3..66a0af51 100644
--- a/repl/src/midi.ts
+++ b/repl/src/midi.ts
@@ -52,7 +52,7 @@ Pattern.prototype.midi = function (output: string, channel = 1) {
       // await enableWebMidi()
       device.playNote(value, channel, {
         time,
-        duration: event.duration * 1000,
+        duration: event.duration * 1000 - 5,
         // velocity: velocity ?? 0.5,
         velocity: 0.9,
       });
diff --git a/repl/src/tunes.ts b/repl/src/tunes.ts
index 0d3b03d4..e0c1d2fb 100644
--- a/repl/src/tunes.ts
+++ b/repl/src/tunes.ts
@@ -34,7 +34,7 @@ export const shapeShifted = `stack(
     b1, b2, b1, b2, e2, e3, e2, e3,
     a1, a2, a1, a2, a1, a2, a1, a2,
   ).rev()
-).slow(16).rev()`;
+).slow(16)`;
 
 export const tetrisMidi = `${shapeShifted}.midi('IAC-Treiber Bus 1')`;
 
@@ -192,3 +192,5 @@ export const whirlyStrudel = `mini("[e4 [b2  b3] c4]")
   .every(3, x => x.slow(1.5))
   .fast(slowcat(1.25,1,1.5))
   .every(2, _ => mini("e4 ~ e3 d4 ~"))`;
+
+export default shapeShifted;