Arpeggiator pad · nex-n2-pro

Using the pre-provided tone.min.js (global Tone), build a clickable pentatonic pad grid that triggers a synth voice with reverb, plus a play/stop button that runs an arpeggiator sequence at an adjustable tempo. All sound synthesized, no audio files.

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user

assistant

thinking

We need answer by creating index.html. Need inspect current directory. Need follow user asks build single-page app, self-contained file index.html, CSS in style, JS in script inline, no external resources except provided tone.min.js loaded plain script src. Need use tone.min.js exact filename. Need make clickable pentatonic pad grid triggers synth voice with reverb, play/stop button arpeggiator adjustable tempo. All sound synthesized no audio files.

Need perhaps implement nice UI. Need ensure no network. Need check tone.min.js present.

→ bash {"command":"ls -la","timeout":10}

toolResult

total 344 drwxr-sr-x. 2 node node 25 Aug 1 19:42 . drwxrwsrwx. 3 root node 16 Aug 1 19:42 .. -rw-r--r--. 1 node node 349169 Aug 1 19:42 tone.min.js

assistant

thinking

Need create index.html. Need maybe inspect Tone version? Could use known APIs. Need maybe read file? maybe not. Need ensure compatibility. Need create. Need decide synth voice with reverb. Tone.js API maybe v14? Need robust. Use Tone.start on user gesture. Create Tone.PolySynth? Reverb via Tone.Reverb. Could use Tone.Synth with envelope. But PolySynth to play chords? "synth voice with reverb" maybe each pad triggers a note with reverb. We can create Tone.PolySynth(Tone.Synth, {...}) through reverb. For pentatonic pad grid. Need adjustable tempo. Arpeggiator sequence. Need play/stop button. Need no audio files. Need maybe create "all sound synthesized". Use Tone.Synth and Reverb. Need maybe "global Tone".

Need create index.html. Need consider browser autoplay restrictions. On click play, start audio. Also pad click. Need maybe create audio context once. Need maybe handle if Tone undefined? But script loads.

Need build nice. Need include:
<!doctype html>
<html lang=en>
<head><meta charset...><script src="tone.min.js"></script><style>...</style></head>
<body>
<div class=app>
header ...
controls: playStop button, tempo range + number display, octave? maybe key select? But user only asked tempo adjustable. Could include key selector? Maybe not. Pentatonic pad grid. Need clickable. Maybe 5x? Pentatonic has 5 notes per octave. Grid maybe 4 rows x 5 cols = 20 pads covering 4 octaves of major pentatonic. Could label C, D, E, G, A. Or minor pentatonic? "pentatonic pad grid" ambiguous. Use C major pentatonic. Maybe include key selector? But single-page. We can include "Key" dropdown maybe. But not asked. Could include key selector to enhance. But requirement adjustable tempo. Need maybe not overcomplicate.

Need implement:
const scale = { majorPentatonic: [0,2,4,7,9] }
baseMidi = 60? grid 4 rows? Maybe rows represent octaves from C3 to C6, cols intervals. Pads = notes C3, D3, E3, G3, A3, C4... C6. But if 4 octaves maybe C3-C6 inclusive 5 rows = 25. Or 4 rows = 20. Clickable pads.
Need arpeggiator sequence: maybe ascending/descending across grid. Use Tone.Transport.scheduleRepeat((time) => { synth.triggerAttackRelease(sequence[index], "8n", time); highlight pad; index++}, "8n"); Tempo = BPM. Tone.Transport.bpm.value = tempo. But "play/stop button that runs an arpeggiator sequence at adjustable tempo." Need maybe if stopped, stop. Use Tone.Transport.start/stop. Need maybe start audio context. Use button text. Need maybe clear highlight.

Need synth voice with reverb:
const reverb = new Tone.Reverb({decay: 2.5, wet: 0.32}).toDestination();
const delay maybe optional. But "with reverb" yes.
const synth = new Tone.PolySynth(Tone.Synth, {
oscillator: {type: "triangle"},
envelope: {attack: 0.01, decay:0.2, sustain:0.2, release:1.2}
}).connect(reverb);
Maybe also add a lowpass filter? Could connect synth to filter to reverb. PolySynth has connect. Need maybe create "voice" with Tone.Synth? PolySynth is okay. Maybe "voice" maybe "synth voice" singular. Use PolySynth for overlapping clicks.

Need maybe create "humanized" voices? Not necessary.

Need maybe use Tone.getTransport().bpm.value. Tone.Transport.bpm.value = tempo.

Need "Tone" script before script. Need no external. Use inline CSS/JS. Need index.html in current dir. Could include instructions? final maybe just confirm.

Need maybe consider if Tone.js script uses global Tone with UMD. Good.

Need maybe make grid responsive.

Need maybe implement "pad click triggers note and visual pulse".
Need maybe implement "keyboard" shortcuts? Not required. Could include.
Need maybe "arpeggiator sequence" can be "1-2-3-5 across octaves" etc. Use sequence array of note names. Need maybe not use Tone.Frequency? We'll calculate.
Need robust note formatting:
const NOTE_NAMES = ["C","C#","D","D#","E","F","F#","G","G#","A","A#","B"];
function midiToNote(midi) { return NOTE_NAMES[midi%12] + (Math.floor(midi/12)-1); }
const pentatonicIntervals = [0,2,4,7,9]; // C major pentatonic
const startMidi = 48; // C3
const octaves = 4; maybe 0..3. total 20. If 5 rows maybe start C3 end C6? C6 midi 72. 4 octaves 48,60,72? 5 rows inclusive. Could use 4 octaves means 4 rows (C3-B5? Actually intervals across 48-67). For nice, 5 rows x 5 cols = 25. Pads.
Need maybe "grid has 5 columns (pentatonic notes) and 5 rows (octaves)"? Actually 5 rows: C3-D3-E3-G3-A3, C4... A4, C5... A5, C6... A6? That's 4 octaves? Start C3 to A6 = 3.8 octaves. If 5 rows, each row octave. Fine.
Maybe create 25. Highlight arpeggio.

Need perhaps "clickable pentatonic pad grid" maybe "pad grid" like MPC. Maybe 5x5 grid. Need "pad" maybe square buttons.

Need maybe include "trigger a synth voice with reverb" on pad click. Need "pad" buttons accessible.

Need maybe "play/stop" button. Need "tempo range + numeric input". Need "stop button" toggles.
Need maybe "sequence" use notes from all pads: sequence = [C3,D3,E3,G3,A3,C4,D4,E4,G4,A4,C5,D5,E5,G5,A5,C6,D6,E6,G6,A6] maybe. But arpeggiator maybe 16-step sequence with rhythm. Could use durations maybe 8n. Maybe create "direction" pattern.
Need maybe use Tone.Transport.scheduleRepeat with stepTime = "8n". For adjustable tempo, "8n" is based on BPM.
Need maybe arpeggio pattern array of midi indexes:
[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1] maybe 32 steps. Then schedule repeat every 8n. At 120 BPM 8n=0.5s, 32 steps=16s. Fine.
Maybe use "Tone.Transport.scheduleRepeat((time) => { const note = notes[pattern[step]]; synth.triggerAttackRelease(note, "8n", time, 0.75); }, "8n");". Need maybe "step" variable. Need maybe "Tone.Transport.cancel()" before schedule? Use once.

Need maybe when playing, highlight pad at time? Use setTimeout? Tone.Draw? Simpler: inside callback use pad.classList.add("playing") then remove after 180ms. Since callback runs near audio time but not exact; okay. Need maybe if tempo too fast, timeouts. Could set CSS animation.

Need maybe "Tone.Transport.start()" returns promise? Since audio context resumed. Need handle:
async function togglePlay() {
await Tone.start();
if (Tone.Transport.state === "started") stop; else start;
}
Need "Tone.start()" returns Promise.

Need maybe "Tone.Destination.volume.value = -6;" optional.
Need maybe "reverb.generate()" asynchronous? Tone.Reverb constructor pre-generates? In Tone.js, Tone.Reverb({decay, wet}) maybe async? Actually Tone.Reverb constructor has generate() async? In Tone v14, Tone.Reverb(options) maybe generates buffer? Need check. It may generate synchronously? Let's recall Tone.js Reverb: constructor(options) { super(options); this._init(options); this._initBuffers(); } maybe generates? There is generate() returns Promise. If not generated, may be silent? Need robust: create reverb = new Tone.Reverb({decay: 2.8, wet: 0.25}).toDestination(); maybe Tone.Reverb constructor generates? I think in Tone 14, `const reverb = new Tone.Reverb(1.5).toDestination();` works. Good.
Need maybe not use external audio files. Fine.

Need maybe include "tone.min.js" before our script. User says library files present load each with plain <script src="NAME"></script>. Need exactly.
Need maybe maybe "tone.min.js" should load in head. Fine.
Need maybe "Tone" global.
Need maybe "script defer"? If in head with script src then inline after, it loads synchronously. Fine.
Need maybe "index.html" content. Need maybe use write. But before writing, maybe not need read. Could write.

Need ensure no network requests. CSS no external fonts. JS no fetch. Good.

Potential issue: Tone.Transport.bpm.value = tempoInput.value; Tone.Transport.start() schedules; if tempo changed while playing, scheduleRepeat uses current BPM. Good.
Potential issue: If stop, sequence step remains; fine.
Potential issue: If user clicks pad before audio start, Tone.start() in triggerPad. Need async. Good.
Potential issue: If Tone is not loaded, show error. But since loaded.
Need maybe "Tone.loaded()" for reverb? Could await Tone.loaded() before play? Not necessary.
Need maybe "Tone.context.resume()" vs Tone.start.

Need maybe "Pad labels" show note names. Use "C3" etc. Maybe small interval label.
Need maybe "grid" with 5 columns.

Need maybe "tempo display" as number.
Need maybe "tempo range min 60 max 200 step 1".
Need maybe "Reset" no.

Need maybe "key selector" optional. Could include key dropdown to transpose pentatonic. But "pentatonic pad grid" maybe fixed. Key selector nice but not necessary. If include, more code. Need maybe keep single file. But maybe user asked only tempo adjustable. Could include key selector but not needed. Additional controls okay? Maybe no.

Need maybe "arpeggiator sequence" maybe direction buttons? Not required. Could include "Direction: up/down" maybe overkill.
Need maybe "tempo adjustable" with slider and numeric.

Need maybe "All sound synthesized, no audio files." Could include label.

Need maybe "synth voice with reverb" maybe actual "voice" with envelope and filter:
const voice = new Tone.PolySynth(Tone.Synth, {
oscillator: {type: "sawtooth"},
envelope: {attack:0.005, decay:0.18, sustain:0.28, release:1.1},
portamento:0.03
});
const filter = new Tone.Filter({type:"lowpass", frequency:2200, Q:0.7}).connect(reverb);
voice.connect(filter);
Maybe sawtooth plus reverb. But "voice" maybe not too harsh. Use triangle+sub? Tone.Synth has oscillator only. Could use Tone.PolySynth(Tone.Synth). Fine.
Maybe create "Tone.PolySynth(Tone.Synth, { oscillator: {type:"triangle"}, envelope: ...})".
Need maybe "reverb wet" 0.35.
Need maybe "Tone.Destination.volume.value = -4".

Need maybe "triggerAttackRelease" with note, "16n"? For pads maybe "8n" release 1.2.
Maybe "synth.triggerAttackRelease(note, "6n", time, velocity)"? Tone.PolySynth triggerAttackRelease(note, duration, time, velocity). Good.
Need maybe "Tone.now()" for click. Use async?
function playNote(note, velocity=0.8) {
synth.triggerAttackRelease(note, "8n", Tone.now()+0.01, velocity);
}
Need maybe no need await.

Need maybe "Tone.start()" before trigger. In event listener:
button.addEventListener("click", async () => { await Tone.start(); ... });
pad.addEventListener("click", async () => { await Tone.start(); synth.triggerAttackRelease(...); });
Need maybe if Tone.start called many times okay.

Need maybe "document.addEventListener('keydown')" for keyboard? Could implement optional. Need maybe map numbers? Not necessary.

Need maybe "CSS in style tag, JS in script tag, inline." Good.

Need maybe "script src=tone.min.js" exact filename. Good.

Need maybe "index.html present." Use write.

→ write /tmp/ws/index.html (13411 bytes)

toolResult

Successfully wrote 13411 bytes to /tmp/ws/index.html

assistant

thinking

Need verify file present maybe maybe no need but should. Need maybe inspect first lines? Need maybe ensure no issues.

→ bash {"command":"ls -l index.html && head -n 5 index.html && tail -n 5 index.html","timeout":10}

toolResult

-rw-r--r--. 1 node node 13412 Aug 1 19:43 index.html <!doctype html> <html lang="en"> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> buildPads(); })(); </script> </body> </html>

assistant

thinking

Done — `index.html` is present in `/tmp/ws`. It uses the provided `tone.min.js` via: ```html <script src="tone.min.js"></script> ``` and includes all CSS/JS inline, with a clickable C major pentatonic pad grid, synthesized Tone.js voice, reverb, and a Play/Stop arpeggiator with adjustable tempo.

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.

RUN

modelnex-n2-pro

vendorNex AGI

harnesspi-agent

generated2026-08-01

EVALUATION

★★★★★ 4/5 working

Pentatonic pad grid with play/tempo controls; clicking and keyboard navigation highlight pads, showing functional interactivity.

Vision grade · anthropic/claude-sonnet-5

MEASUREMENTS

Raw readings from the capture, not a verdict — the grade above is the only judgement. Percentages are how much of the screen changed; the measure under-reports sparse motion on a dark background.

idle motion0.0%

on click0.0%

on drag0.4%

on wheel0.3%

on enter + space46.6%

on arrow keys31.5%

on w/a/s/d0.0%

frame spread26.6 / 255

console errors0

js errors none

METRICS

runtime55.9s

tokens in12k

tokens out8.2k

cached12k

cost / run$0.0115