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Image: u/bopittwistiteatit on Reddit · The purple pocket synth with its pads on a phone

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A pocket synth in a browser tab

A free polyphonic subtractive synth built with Claude Code, with a 16-step sequencer, arpeggiator and pads that bend the note when you rock your finger.

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Credits

  • Reddit poster bopittwistiteatit Source ↗

Earliest dated source: 10 Nov 2026

The full story

A free polyphonic, subtractive synth that runs in a browser tab or on a phone: two detuned oscillators and a resonant low-pass per note, filter envelope, LFO, echo, reverb, a 16-step sequencer with swing and an arpeggiator. Moving your finger sideways on a pad bends the note up to a semitone, and any movement pushes it into the reverb. It was built with Claude Code, including the scripted demo performance.

How it was done

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Sources

From a short post by the maker, so the details are as they tell them.

  • Reddit: I built a free pocket synth that runs in a browser tab. Hold a pad and rock your finger for vibrato Forum threadreddit.com
    Reddit poster: bopittwistiteatitPosted 10 Nov 2026

    The maker's post.

  • The project: me.raffi.websiteBlog or write-upme.raffi.website

    The synth.

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Prompt & Solder

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