Matthew Caldwell has created a free experimental AUv3 plugin that combines modulated filtering and delay in the frequency domain, giving results that sit somewhere between classic modulated delays and full-on spectral mangling. The interface is intentionally minimal — just a handful of knobs — so you can quickly twist parameters until something interesting (or completely broken) appears. It works as an AUv3 effect in hosts like AUM, GarageBand, Logic Pro for iPad, or Drambo on both iPhone and iPad.
Many users already love how unpredictable and inspiring it feels. You can dial in gentle, watery echoes or push it into glitchy, metallic, almost granular territory. The lack of a preset system is part of the charm — it encourages real-time experimentation rather than relying on saved settings. Because it’s completely free with no ads or tracking, it feels like a genuine creative gift to the iOS community.
For iPad music production, FrobulatorAU is perfect for adding character to synths, guitars, vocals, or even full drum buses. It’s especially fun on pads and textures where the spectral processing creates evolving, otherworldly movement. The only real downside is that it’s very much an “experimental” tool — results can be hit-or-miss, and you’ll probably discard quite a few settings before landing on something you love. But when it clicks, it clicks hard.
Key features include:
- Spectral delay combined with modulated filtering
- Simple, knob-based interface for fast experimentation
- AUv3 effect plugin (no standalone mode)
- Low CPU usage and responsive real-time processing
- Completely free with no ads or tracking
App price: Free.
No in-app purchases.
Original release: Older app | Latest update: March 2026
