diff --git a/examples/worker-repl/main.js b/examples/worker-repl/main.js
index 059d2065..a4e5e1da 100644
--- a/examples/worker-repl/main.js
+++ b/examples/worker-repl/main.js
@@ -4,22 +4,57 @@ import { setInterval, clearInterval } from 'worker-timers'; // comment out this
 
 let loaded = samples('github:tidalcycles/dirt-samples');
 async function run() {
-  // let pat = seq('hh').s().fast(25.2);
+  //let pat = seq('hh').s().fast(25.2);
   let pat = seq('bd', ['hh', 'hh'], 'jvbass').s().fast(1.92);
   await initAudioOnFirstClick();
   await loaded;
   const ctx = getAudioContext();
   let last = 0;
+  let cps = 0.6;
+  let num_ticks_since_cps_change = 0;
+  let num_cycles_at_cps_change = 0;
+  let seconds_at_cps_change;
+  let latency = 0.1;
+
+  function setCps(_cps) {
+    if (_cps === cps) {
+      return;
+    }
+    cps = _cps;
+    num_ticks_since_cps_change = 0;
+  }
+
   const clock = createClock(
     () => ctx.currentTime,
     (phase, duration, tick, t) => {
-      const [begin, end] = [last, (last = tick * duration)];
-      console.log('q', begin.toFixed(2), end.toFixed(2), phase.toFixed(2));
-      let haps = pat.queryArc(begin, end).filter((h) => h.hasOnset());
-      // console.log('phase', phase, haps.length);
-      haps.forEach((hap) => {
-        superdough(hap.value, '=' + String(hap.whole.begin + 0.1));
-      });
+      if (num_ticks_since_cps_change === 0) {
+        console.log('changed cps..!!', cps);
+        num_cycles_at_cps_change = last;
+        seconds_at_cps_change = phase;
+      }
+      num_ticks_since_cps_change++;
+      const seconds_since_cps_change = num_ticks_since_cps_change * duration;
+      const num_cycles_since_cps_change = seconds_since_cps_change * cps;
+
+      const [begin, end] = [last, (last = num_cycles_at_cps_change + num_cycles_since_cps_change)];
+
+      console.log(
+        'q',
+        begin.toFixed(2),
+        end.toFixed(2),
+        phase.toFixed(2),
+        '#',
+        (end - begin).toFixed(2),
+        duration.toFixed(2),
+      );
+
+      pat
+        .queryArc(begin, end, { _cps: cps })
+        .filter((h) => h.hasOnset())
+        .forEach((hap) => {
+          const deadline = (hap.whole.begin - num_cycles_at_cps_change) / cps + seconds_at_cps_change + latency;
+          superdough(hap.value, '=' + deadline);
+        });
     },
     0.025, // duration of each cycle
     0.1, // interval between callbacks
@@ -29,6 +64,13 @@ async function run() {
     false,
   );
   clock.start();
+  setTimeout(() => {
+    console.log('change cps!!!!!!!!!!!!!!!!!!!!');
+    setCps(1.2);
+  }, 6000);
+  setTimeout(() => {
+    clock.stop();
+  }, 12000);
 }
 
 run();