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Email support@worried.studio. Tell us your device, iOS version, and what happened — the more detail, the faster we can help.

Quite a lot: three sound engines (FM, CLUSTER and PULSE), the PATTERN and ARP sequencers, the full 4-track tape, the mixer and Perform mode, three effects plus bypass (SPRING reverb, BAT filter, PUNCH compressor), and two saved projects. It's a complete little studio on its own.

A single one-time Spool Pro purchase unlocks all fourteen engines, sampling (mic recording and importing audio from Files), the full 11-effect rack, every sequencer, unlimited projects, WAV mixdown export, and MIDI input — plus every engine and effect we add in the future. There is no subscription.

Tap the ⓘ About button in the top bar (or open the unlock screen) and tap Restore Purchases. As long as you are signed in with the same Apple ID that made the purchase, it will unlock immediately.

Connect a class-compliant USB MIDI controller (via a USB-C or Lightning adapter) — spool. picks it up automatically, hot-plug included. For Bluetooth, open the MIDI settings (piano icon) and tap Bluetooth MIDI… to pair. (MIDI input is a Spool Pro feature.)

Only so you can sample sound into the sampler, drum kits, or the TALK vocoder. Audio captured from the mic is processed entirely on your device and is never sent anywhere. See our privacy policy.

Yes. With the SAMPLER or DRUM engine selected, tap FILE to import any audio file — even a whole song. A crop screen opens where you pinch to zoom, drag the handles around the part you want, audition it, and confirm. Stereo files stay stereo. (Sampling is a Spool Pro feature.)

Microphone recordings run up to about 12 seconds at 48 kHz. After recording you can crop the sample in the waveform editor before playing it across the keys or slicing it into a kit.

In the Mixer, open the OUT page: tap MIXDOWN and play your song down — spool. records everything you hear at the master output. Stop, then tap EXPORT WAV to save it to the Files app. Mixdown export is a Spool Pro feature.

Yes — tap the ⓘ About button and pick a buffer size under Audio: 128 (tightest), 256 (default) or 512 (safest on older devices). Note that Bluetooth speakers and headphones always add their own delay, whatever you pick — wired output feels tightest.

iPhone and iPad running iOS/iPadOS 17 or later, in both portrait and landscape.