Spool Pro & purchases

spool. is free to download and genuinely useful on its own. A single one-time Spool Pro purchase unlocks the full instrument — no subscription, ever.

What’s free

• Three sound engines: FM, CLUSTER and PULSE
• The PATTERN and ARP sequencers
• The full 4-track tape, mixer, and Perform mode
• Three effects plus bypass: SPRING reverb, the BAT filter, and the PUNCH compressor
• Two saved projects

What Spool Pro unlocks

• All fourteen engines — including both drum machines, the TALK vocoder, CLOUD granular and the SAMPLER
• Sampling — microphone recording and importing audio from Files
• The full effect rack (all 11, including DELAY, GRID, SWIRL, JET, WAVE, STUT and HALO)
• The STREAM, TAPS and GUMBALL sequencers
• Unlimited projects
• WAV mixdown export
• MIDI input
• Every engine and effect added in the future — one purchase covers them all

Previewing locked engines

Locked engines aren’t hidden. Open one and spool. shows “PRO preview — silent” — the visualizer animates and the knobs respond so you can feel the engine out; playing a key brings up the unlock screen.

Restoring a purchase

Bought Spool Pro and it shows locked (new phone, reinstall)? Tap the ⓘ About button (top bar) — or the unlock screen — and hit Restore Purchases. As long as you’re signed in with the same Apple ID you bought it with, it unlocks right away.

Questions about a purchase

Payment and refunds are handled by Apple, but if something isn’t unlocking as it should, email support@worried.studio and we’ll sort it out.