diff --git a/packages/codemirror/codemirror.mjs b/packages/codemirror/codemirror.mjs
index b9147226..39429432 100644
--- a/packages/codemirror/codemirror.mjs
+++ b/packages/codemirror/codemirror.mjs
@@ -5,6 +5,7 @@ import { syntaxHighlighting, defaultHighlightStyle } from '@codemirror/language'
 import { javascript } from '@codemirror/lang-javascript';
 import { StateField, StateEffect } from '@codemirror/state';
 import { oneDark } from './themes/one-dark';
+import { repl, Drawer } from '@strudel.cycles/core';
 
 // https://codemirror.net/docs/guide/
 export function initEditor({ initialCode = '', onChange, onEvaluate, onStop, theme = oneDark, root }) {
@@ -127,22 +128,72 @@ export const flash = (view, ms = 200) => {
 };
 
 export class StrudelMirror {
-  constructor({ root, initialCode = '', onEvaluate, onStop }) {
+  constructor(options) {
+    const { root, initialCode = '', onDraw, drawTime = [-2, 2], prebake, ...replOptions } = options;
     this.code = initialCode;
-    this.view = initEditor({
+
+    this.drawer = new Drawer((haps, time) => {
+      const currentFrame = haps.filter((hap) => time >= hap.whole.begin && time <= hap.whole.end);
+      this.highlight(currentFrame);
+      onDraw?.(haps, time, currentFrame);
+    }, drawTime);
+
+    const prebaked = prebake();
+    prebaked.then(async () => {
+      if (!onDraw) {
+        return;
+      }
+      const { scheduler, evaluate } = await this.repl;
+      // draw first frame instantly
+      prebaked.then(async () => {
+        await evaluate(this.code, false);
+        this.drawer.invalidate(scheduler);
+        onDraw?.(this.drawer.visibleHaps, 0, []);
+      });
+    });
+
+    this.repl = repl({
+      ...replOptions,
+      onToggle: async (started) => {
+        replOptions?.onToggle?.(started);
+        const { scheduler } = await this.repl;
+        if (started) {
+          this.drawer.start(scheduler);
+        } else {
+          this.drawer.stop();
+        }
+      },
+      beforeEval: async () => {
+        await prebaked;
+      },
+      afterEval: (options) => {
+        replOptions?.afterEval?.(options);
+        this.drawer.invalidate();
+      },
+    });
+    this.editor = initEditor({
       root,
       initialCode,
       onChange: (v) => {
         this.code = v.state.doc.toString();
       },
-      onEvaluate,
-      onStop,
+      onEvaluate: () => this.evaluate(),
+      onStop: () => this.stop(),
     });
   }
+  async evaluate() {
+    const { evaluate } = await this.repl;
+    this.flash();
+    await evaluate(this.code);
+  }
+  async stop() {
+    const { scheduler } = await this.repl;
+    scheduler.stop();
+  }
   flash(ms) {
-    flash(this.view, ms);
+    flash(this.editor, ms);
   }
   highlight(haps) {
-    highlightHaps(this.view, haps);
+    highlightHaps(this.editor, haps);
   }
 }
diff --git a/packages/codemirror/package.json b/packages/codemirror/package.json
index 6ea2ac25..a4ebf03a 100644
--- a/packages/codemirror/package.json
+++ b/packages/codemirror/package.json
@@ -38,7 +38,8 @@
     "@codemirror/language": "^6.6.0",
     "@codemirror/state": "^6.2.0",
     "@codemirror/view": "^6.10.0",
-    "@lezer/highlight": "^1.1.4"
+    "@lezer/highlight": "^1.1.4",
+    "@strudel.cycles/core": "workspace:*"
   },
   "devDependencies": {
     "vite": "^4.3.3"
diff --git a/packages/core/draw.mjs b/packages/core/draw.mjs
index bc6d3cd8..58b14040 100644
--- a/packages/core/draw.mjs
+++ b/packages/core/draw.mjs
@@ -97,19 +97,18 @@ export class Drawer {
       },
     );
   }
-  check() {
-    if (!this.scheduler) {
-      throw new Error('no scheduler set..');
+  invalidate(scheduler = this.scheduler) {
+    if (!scheduler) {
+      return;
     }
-  }
-  invalidate() {
-    this.check();
-    const t = this.scheduler.now();
+    this.scheduler = scheduler;
+    const t = scheduler.now();
     let [_, lookahead] = this.drawTime;
+    const [begin, end] = [Math.max(t, 0), t + lookahead + 0.1];
     // remove all future haps
     this.visibleHaps = this.visibleHaps.filter((h) => h.whole.begin < t);
     // query future haps
-    const futureHaps = this.scheduler.pattern.queryArc(Math.max(t, 0), t + lookahead + 0.1); // +0.1 = workaround for weird holes in query..
+    const futureHaps = scheduler.pattern.queryArc(begin, end); // +0.1 = workaround for weird holes in query..
     // append future haps
     this.visibleHaps = this.visibleHaps.concat(futureHaps);
   }
diff --git a/packages/core/examples/vite-vanilla-repl-cm6/main.js b/packages/core/examples/vite-vanilla-repl-cm6/main.js
index a8a1c754..425799be 100644
--- a/packages/core/examples/vite-vanilla-repl-cm6/main.js
+++ b/packages/core/examples/vite-vanilla-repl-cm6/main.js
@@ -1,69 +1,39 @@
-// moved from sandbox: https://codesandbox.io/s/vanilla-codemirror-strudel-2wb7yw?file=/index.html:114-186
-
 import { StrudelMirror } from '@strudel/codemirror';
-import { initStrudel } from './strudel';
 import { funk42 } from './tunes';
-import { pianoroll, getDrawOptions, Drawer } from '@strudel.cycles/core';
+import { drawPianoroll, evalScope, controls } from '@strudel.cycles/core';
 import './style.css';
 import { initAudioOnFirstClick } from '@strudel.cycles/webaudio';
+import { transpiler } from '@strudel.cycles/transpiler';
+import { getAudioContext, webaudioOutput, registerSynthSounds } from '@strudel.cycles/webaudio';
+import { registerSoundfonts } from '@strudel.cycles/soundfonts';
 
-const initAudio = initAudioOnFirstClick();
-
-const editor = new StrudelMirror({
-  root: document.getElementById('editor'),
-  initialCode: funk42,
-  onEvaluate,
-  onStop,
-});
-
-async function drawFirstFrame(editor, repl) {
-  const { evaluate } = repl;
-  const pattern = await evaluate(editor.code, false);
-  const initialHaps = pattern.queryArc(0, drawTime[1]);
-  drawPianoroll(initialHaps, 0);
-  return repl;
-}
-
-const repl = initStrudel().then(async (repl) => {
-  await drawFirstFrame(editor, repl);
-  return repl;
-});
-
+// init canvas
 const canvas = document.getElementById('roll');
 canvas.width = canvas.width * 2;
 canvas.height = canvas.height * 2;
+const drawContext = canvas.getContext('2d');
+const drawTime = [-2, 2]; // time window of drawn haps
 
-async function onEvaluate() {
-  const { evaluate, scheduler } = await repl;
-  await initAudio;
-  editor.flash();
-  if (!scheduler.started) {
-    scheduler.stop();
-    await evaluate(editor.code);
-    drawer.start(scheduler);
-  } else {
-    await evaluate(editor.code);
-    drawer.invalidate(); // this is a bit mystic
-  }
-}
+const editor = new StrudelMirror({
+  defaultOutput: webaudioOutput,
+  getTime: () => getAudioContext().currentTime,
+  transpiler,
+  root: document.getElementById('editor'),
+  initialCode: funk42,
+  drawTime,
+  onDraw: (haps, time) => drawPianoroll({ haps, time, ctx: drawContext, drawTime, fold: 0 }),
+  prebake: async () => {
+    initAudioOnFirstClick(); // needed to make the browser happy (don't await this here..)
+    const loadModules = evalScope(
+      controls,
+      import('@strudel.cycles/core'),
+      import('@strudel.cycles/mini'),
+      import('@strudel.cycles/tonal'),
+      import('@strudel.cycles/webaudio'),
+    );
+    await Promise.all([loadModules, registerSynthSounds(), registerSoundfonts()]);
+  },
+});
 
-async function onStop() {
-  const { scheduler } = await repl;
-  scheduler.stop();
-  drawer.stop();
-}
-
-const drawTime = [-2, 2];
-function drawPianoroll(haps, time) {
-  pianoroll({ ctx, time, haps, ...getDrawOptions(drawTime, { fold: 0 }) });
-}
-
-const ctx = canvas.getContext('2d');
-let drawer = new Drawer((haps, time) => {
-  const currentFrame = haps.filter((hap) => time >= hap.whole.begin && time <= hap.whole.end);
-  editor.highlight(currentFrame);
-  drawPianoroll(haps, time);
-}, drawTime);
-
-document.getElementById('play').addEventListener('click', () => onEvaluate());
-document.getElementById('stop').addEventListener('click', async () => onStop());
+document.getElementById('play').addEventListener('click', () => editor.evaluate());
+document.getElementById('stop').addEventListener('click', () => editor.stop());
diff --git a/packages/core/examples/vite-vanilla-repl-cm6/strudel.js b/packages/core/examples/vite-vanilla-repl-cm6/strudel.js
deleted file mode 100644
index de9b2cd7..00000000
--- a/packages/core/examples/vite-vanilla-repl-cm6/strudel.js
+++ /dev/null
@@ -1,28 +0,0 @@
-import { getAudioContext, webaudioOutput, registerSynthSounds } from '@strudel.cycles/webaudio';
-
-const ctx = getAudioContext();
-
-export async function initStrudel(options = {}) {
-  const [{ controls, repl, evalScope }, { registerSoundfonts }, { transpiler }] = await Promise.all([
-    import('@strudel.cycles/core'),
-    import('@strudel.cycles/soundfonts'),
-    import('@strudel.cycles/transpiler'),
-  ]);
-
-  const loadModules = evalScope(
-    controls,
-    import('@strudel.cycles/core'),
-    import('@strudel.cycles/mini'),
-    import('@strudel.cycles/tonal'),
-    import('@strudel.cycles/webaudio'),
-  );
-
-  await Promise.all([loadModules, registerSynthSounds(), registerSoundfonts()]);
-
-  return repl({
-    defaultOutput: webaudioOutput,
-    getTime: () => ctx.currentTime,
-    transpiler,
-    ...options,
-  });
-}
diff --git a/packages/core/examples/vite-vanilla-repl-cm6/tunes.mjs b/packages/core/examples/vite-vanilla-repl-cm6/tunes.mjs
index b235aa95..242a0d4b 100644
--- a/packages/core/examples/vite-vanilla-repl-cm6/tunes.mjs
+++ b/packages/core/examples/vite-vanilla-repl-cm6/tunes.mjs
@@ -78,7 +78,7 @@ let drums = stack(
   s("bd*2, ~ sd").bank('RolandTR707').room("0 .1"),
   s("hh*4").begin(.2).release(.02).end(.25).release(.02)
   .gain(.3).bank('RolandTR707').late(.02).room(.5),
-  s("shaker_small").struct("[x x*2]*2").speed(".8,.9").release(.02)
+  //s("shaker_small").struct("[x x*2]*2").speed(".8,.9").release(.02)
 ).fast(2)
 
 let wurli = note(\`<
diff --git a/packages/core/pianoroll.mjs b/packages/core/pianoroll.mjs
index b0f4c074..336bd428 100644
--- a/packages/core/pianoroll.mjs
+++ b/packages/core/pianoroll.mjs
@@ -175,3 +175,8 @@ Pattern.prototype.pianoroll = function (options) {
     pianoroll({ ctx, time, haps, ...getDrawOptions(drawTime, { fold: 0, ...options }) }),
   );
 };
+
+export function drawPianoroll(options) {
+  const { drawTime, ...rest } = options;
+  pianoroll({ ...getDrawOptions(drawTime), ...rest });
+}