Automatic Turntablism

SCRATCH

v1.0.0-beta — beta · Standalone + AU · macOS Apple Silicon

Free download

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Beta build. No payment, no account.

Binary upload pending — check back soon.

v1.0.0-beta — What's new ▾

Hands-free turntablism — pick a scratch pattern, lock it to the beat, it scratches the incoming audio
PATTERN: Baby (smooth forward/back) · Chirp (forward stab + quick pull) · Transform (steady motion gated by the fader) · Scribble (fast small back-and-forth)
RATE: tempo-synced — the scratch rate is a note division (vm_sync, host BPM); SYNC default ON so it sits in time, web TAP for standalone
DEPTH: pitch excursion — how far the platter is thrown (subtle wiggle → full rewind-stab)
Transform & Chirp add a CHOP-style squared-LFO fader gate — the on/off cut is half the scratch sound
Built on vmtape’s vm_scratchhead (the reverse-capable read head, sibling of vm_transport) driven by a vm_lfo-shaped bipolar motion + vm_sync; bit-exact dry at DEPTH 0 / MIX 0, bounded read (no latency creep)

Not notarized yet. Run once:

xattr -dr com.apple.quarantine /Applications/SCRATCH.app

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