Drum machine · muse-ember
Output generated Cost / run $0.0170 Runtime 62.7s
Prompt for this run
Build a 16-step drum sequencer using the Web Audio API. Use HTML, CSS, and JavaScript as needed. Write it to `index.html` in the current working directory using your file tools. Inline your own CSS and JavaScript. Do not use external assets, CDNs, or network requests. No third-party libraries are provided. Required behavior: - Show four labeled rows for kick, snare, hi-hat, and clap, each with 16 independently toggleable steps. Start with a simple audible pattern. - Treat the 16 steps as one bar of sixteenth notes in 4/4 time. Provide Play, Stop, Clear, and a BPM control from 60 to 180. - During playback, highlight the current step and synthesize the enabled drum voices. Editing steps or BPM must affect playback without creating duplicate sequences. - Stop cancels future hits and resets the playhead to the first step. Clear disables all steps. Starting again uses the currently displayed pattern. - Unlock audio through a user gesture and synthesize distinct percussion sounds from oscillators/noise and envelopes; do not load audio files. Verify: Toggle a step and start playback. Check that the playhead advances across the grid and responds to a BPM change. Stop and start again, checking that the displayed pattern is retained and the playhead restarts from the first step.
TAKE IT TO CODE
A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.
METRICS
Transcript · 33 messages
Build a 16-step drum sequencer using the Web Audio API. Use HTML, CSS, and JavaScript as needed. Write it to `index.html` in the current working directory using your file tools. Inline your own CSS and JavaScript. Do not use external assets, CDNs, or network requests. No third-party libraries are provided. Required behavior: - Show four labeled rows for kick, snare, hi-hat, and clap, each with 16 independently toggleable steps. Start with a simple audible pattern. - Treat the 16 steps as one bar of sixteenth notes in 4/4 time. Provide Play, Stop, Clear, and a BPM control from 60 to 180. - During playback, highlight the current step and synthesize the enabled drum voices. Editing steps or BPM must affect playback without creating duplicate sequences. - Stop cancels future hits and resets the playhead to the first step. Clear disables all steps. Starting again uses the currently displayed pattern. - Unlock audio through a user gesture and synthesize distinct percussion sounds from oscillators/noise and envelopes; do not load audio files. Verify: Toggle a step and start playback. Check that the playhead advances across the grid and responds to a BPM change. Stop and start again, checking that the displayed pattern is retained and the playhead restarts from the first step.
thinking
{"command":"pwd; ls -la"}/tmp/job-37QhKb total 12 drwx------ 3 node node 4096 Nov 10 01:04 . drwxrwxrwt 8 root root 4096 Nov 10 01:04 .. drwxr-xr-x 3 node node 4096 Nov 10 01:04 .home
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index.html (15838 bytes)Successfully wrote to index.html
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{"action":"inspect"}Frame 1, +1ms
[Browser image supplied to model]
{"console":[],"dom":"🥁 16-Step Drum Sequencer\nOne bar of sixteenth notes in 4/4 — synthesized live with the Web Audio API. No audio files.\nReady — press Play to hear the pattern.\n▶ Play\n■ Stop\nClear\nBPM\n120 BPM\nStep\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\nKick\nSnare\nHi-Hat\nClap\nClick / tap a step to toggle it. Edits take effect on the next pass without restarting.\nSteps are grouped in beats of 4.\n\nAudio is unlocked on the Play gesture (browsers require a user interaction). Stop cancels scheduled hits and returns the playhead to step 1. Clear removes every step; starting again always uses the pattern currently shown.","images":"attached"}
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{"action":"click","x":235,"y":198}Frame 1, +0ms
[Browser image supplied to model]
{"console":[],"dom":"🥁 16-Step Drum Sequencer\nOne bar of sixteenth notes in 4/4 — synthesized live with the Web Audio API. No audio files.\nReady — press Play to hear the pattern.\n▶ Play\n■ Stop\nClear\nBPM\n120 BPM\nStep\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\nKick\nSnare\nHi-Hat\nClap\nClick / tap a step to toggle it. Edits take effect on the next pass without restarting.\nSteps are grouped in beats of 4.\n\nAudio is unlocked on the Play gesture (browsers require a user interaction). Stop cancels scheduled hits and returns the playhead to step 1. Clear removes every step; starting again always uses the pattern currently shown.","images":"attached"}
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{"action":"click","x":278,"y":225}Frame 1, +0ms
[Browser image supplied to model]
{"console":[],"dom":"🥁 16-Step Drum Sequencer\nOne bar of sixteenth notes in 4/4 — synthesized live with the Web Audio API. No audio files.\nStep 2 (kick) on — press Play to hear it.\n▶ Play\n■ Stop\nClear\nBPM\n120 BPM\nStep\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\nKick\nSnare\nHi-Hat\nClap\nClick / tap a step to toggle it. Edits take effect on the next pass without restarting.\nSteps are grouped in beats of 4.\n\nAudio is unlocked on the Play gesture (browsers require a user interaction). Stop cancels scheduled hits and returns the playhead to step 1. Clear removes every step; starting again always uses the pattern currently shown.","images":"attached"}
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{"action":"screenshot"}Frame 1, +0ms
[Browser image supplied to model]
{"console":[],"dom":"🥁 16-Step Drum Sequencer\nOne bar of sixteenth notes in 4/4 — synthesized live with the Web Audio API. No audio files.\nStep 2 (kick) on — press Play to hear it.\n▶ Play\n■ Stop\nClear\nBPM\n120 BPM\nStep\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\nKick\nSnare\nHi-Hat\nClap\nClick / tap a step to toggle it. Edits take effect on the next pass without restarting.\nSteps are grouped in beats of 4.\n\nAudio is unlocked on the Play gesture (browsers require a user interaction). Stop cancels scheduled hits and returns the playhead to step 1. Clear removes every step; starting again always uses the pattern currently shown.","images":"attached"}
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{"action":"click","x":150,"y":140}Frame 1, +0ms
[Browser image supplied to model]
{"console":[],"dom":"🥁 16-Step Drum Sequencer\nOne bar of sixteenth notes in 4/4 — synthesized live with the Web Audio API. No audio files.\nPlaying — step 1 / 16 at 120 BPM\n⏸ Playing\n■ Stop\nClear\nBPM\n120 BPM\nStep\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\nKick\nSnare\nHi-Hat\nClap\nClick / tap a step to toggle it. Edits take effect on the next pass without restarting.\nSteps are grouped in beats of 4.\n\nAudio is unlocked on the Play gesture (browsers require a user interaction). Stop cancels scheduled hits and returns the playhead to step 1. Clear removes every step; starting again always uses the pattern currently shown.","images":"attached"}
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{"action":"motion"}Frame 1, +0ms
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Frame 2, +607ms
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Frame 3, +1209ms
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Frame 4, +1826ms
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{"console":[],"dom":"🥁 16-Step Drum Sequencer\nOne bar of sixteenth notes in 4/4 — synthesized live with the Web Audio API. No audio files.\nPlaying — step 11 / 16 at 120 BPM\n⏸ Playing\n■ Stop\nClear\nBPM\n120 BPM\nStep\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\nKick\nSnare\nHi-Hat\nClap\nClick / tap a step to toggle it. Edits take effect on the next pass without restarting.\nSteps are grouped in beats of 4.\n\nAudio is unlocked on the Play gesture (browsers require a user interaction). Stop cancels scheduled hits and returns the playhead to step 1. Clear removes every step; starting again always uses the pattern currently shown.","images":"attached"}
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{"action":"drag","x":910,"y":138,"toX":1010,"toY":138}Frame 1, +0ms
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{"console":[],"dom":"🥁 16-Step Drum Sequencer\nOne bar of sixteenth notes in 4/4 — synthesized live with the Web Audio API. No audio files.\nPlaying — step 4 / 16 at 180 BPM\n⏸ Playing\n■ Stop\nClear\nBPM\n180 BPM\nStep\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\nKick\nSnare\nHi-Hat\nClap\nClick / tap a step to toggle it. Edits take effect on the next pass without restarting.\nSteps are grouped in beats of 4.\n\nAudio is unlocked on the Play gesture (browsers require a user interaction). Stop cancels scheduled hits and returns the playhead to step 1. Clear removes every step; starting again always uses the pattern currently shown.","images":"attached"}
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{"action":"click","x":270,"y":140}Frame 1, +0ms
[Browser image supplied to model]
{"console":[],"dom":"🥁 16-Step Drum Sequencer\nOne bar of sixteenth notes in 4/4 — synthesized live with the Web Audio API. No audio files.\nStopped — playhead reset to step 1. Pattern retained.\n▶ Play\n■ Stop\nClear\nBPM\n180 BPM\nStep\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\nKick\nSnare\nHi-Hat\nClap\nClick / tap a step to toggle it. Edits take effect on the next pass without restarting.\nSteps are grouped in beats of 4.\n\nAudio is unlocked on the Play gesture (browsers require a user interaction). Stop cancels scheduled hits and returns the playhead to step 1. Clear removes every step; starting again always uses the pattern currently shown.","images":"attached"}
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{"action":"click","x":150,"y":140}Frame 1, +0ms
[Browser image supplied to model]
{"console":[],"dom":"🥁 16-Step Drum Sequencer\nOne bar of sixteenth notes in 4/4 — synthesized live with the Web Audio API. No audio files.\nPlaying — step 1 / 16 at 180 BPM\n⏸ Playing\n■ Stop\nClear\nBPM\n180 BPM\nStep\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\nKick\nSnare\nHi-Hat\nClap\nClick / tap a step to toggle it. Edits take effect on the next pass without restarting.\nSteps are grouped in beats of 4.\n\nAudio is unlocked on the Play gesture (browsers require a user interaction). Stop cancels scheduled hits and returns the playhead to step 1. Clear removes every step; starting again always uses the pattern currently shown.","images":"attached"}
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{"action":"click","x":270,"y":140}Frame 1, +0ms
[Browser image supplied to model]
{"console":[],"dom":"🥁 16-Step Drum Sequencer\nOne bar of sixteenth notes in 4/4 — synthesized live with the Web Audio API. No audio files.\nStopped — playhead reset to step 1. Pattern retained.\n▶ Play\n■ Stop\nClear\nBPM\n180 BPM\nStep\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\nKick\nSnare\nHi-Hat\nClap\nClick / tap a step to toggle it. Edits take effect on the next pass without restarting.\nSteps are grouped in beats of 4.\n\nAudio is unlocked on the Play gesture (browsers require a user interaction). Stop cancels scheduled hits and returns the playhead to step 1. Clear removes every step; starting again always uses the pattern currently shown.","images":"attached"}
{"action":"click","x":345,"y":140}Frame 1, +0ms
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{"console":[],"dom":"🥁 16-Step Drum Sequencer\nOne bar of sixteenth notes in 4/4 — synthesized live with the Web Audio API. No audio files.\nCleared — all steps off. Toggle steps or press Play for silence-then-pattern.\n▶ Play\n■ Stop\nClear\nBPM\n180 BPM\nStep\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\nKick\nSnare\nHi-Hat\nClap\nClick / tap a step to toggle it. Edits take effect on the next pass without restarting.\nSteps are grouped in beats of 4.\n\nAudio is unlocked on the Play gesture (browsers require a user interaction). Stop cancels scheduled hits and returns the playhead to step 1. Clear removes every step; starting again always uses the pattern currently shown.","images":"attached"}
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{"action":"inspect"}Frame 1, +0ms
[Browser image supplied to model]
{"console":[],"dom":"🥁 16-Step Drum Sequencer\nOne bar of sixteenth notes in 4/4 — synthesized live with the Web Audio API. No audio files.\nCleared — all steps off. Toggle steps or press Play for silence-then-pattern.\n▶ Play\n■ Stop\nClear\nBPM\n180 BPM\nStep\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\nKick\nSnare\nHi-Hat\nClap\nClick / tap a step to toggle it. Edits take effect on the next pass without restarting.\nSteps are grouped in beats of 4.\n\nAudio is unlocked on the Play gesture (browsers require a user interaction). Stop cancels scheduled hits and returns the playhead to step 1. Clear removes every step; starting again always uses the pattern currently shown.","images":"attached"}
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{"command":"ls -lh index.html; grep -c \"http\" index.html || true; grep -E \"src=|href=|cdn\" index.html || echo \"no external refs\""}-rw-r--r-- 1 node node 16K Nov 10 01:04 index.html 0 no external refs
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Built and verified `index.html` (single self-contained file, inline CSS/JS, no external resources/CDNs). **Implementation:** - 4 labeled rows (Kick, Snare, Hi-Hat, Clap) × 16 toggleable steps, grouped in beats of 4, with a default audible pattern (kick on 1/9/15, snare+clap on 5/13, hi-hat every other step). - Play / Stop / Clear + BPM slider (60–180, default 120). Lookahead scheduler (`setInterval` 25 ms, 0.12 s lookahead, step = 60/BPM/4) reads live pattern and live BPM, so edits/BPM changes take effect without restarting; a single timer guard prevents duplicate sequences. - Playhead highlighted via a draw queue synced to `AudioContext.currentTime`. - Stop clears the interval/draw queue and resets the playhead to step 1; Clear zeroes the pattern; restarting uses the currently displayed pattern. - Audio unlocked on the Play gesture; distinct synthesized voices from oscillators/noise buffers with envelopes (sine pitch-drop kick, noise+triangle snare, high-passed noise hi-hat, bursted band-pass noise clap). No audio files. **Checked in the browser (console clean):** - Toggled Kick step 2 on — status and grid updated. - Play — playhead advanced 11 → 16 → 5 → 10 across motion frames. - Dragged BPM slider to 180 while playing — status updated to “180 BPM” and playback continued live. - Stop — playhead reset to step 1, pattern (including the toggled step) retained. - Play again — restarted from step 1 at 180 BPM with the retained pattern. - Clear — all steps visibly disabled. **Remaining unverified:** Actual audible tone/quality of each synthesized voice (no audio output available in the headless browser to listen to), and behavior on real mobile/touch devices.