AudioKit Pro updates Synth One J6 with AUv3 MIDI support

AudioKit Pro rolled out version 0.95.4 of Synth One J6, tightening host integration and smoothing tuning behavior for iOS synth players. The headline change is AUv3 MIDI Program Change support, which lets hosts that send program change messages - AUM being a primary example - switch Synth One J6 programs from the host rather than forcing manual recall. That matters for performers, session players, and preset-heavy workflows where seamless program changes can replace a tangle of manual patching or onstage menu diving.

The update also improves handling of alternate “A” tunings. Presets can now recall alternate tunings such as 432 Hz, and a new Lock button prevents tuning from shifting when you swap presets. That addresses a common pain point: losing a historical or nonstandard reference pitch mid-set. For users who like to move between modern equal temperament and vintage or experimental tunings without retuning hardware, the lock adds a useful layer of reliability.

A small but practical usability fix closed out the release notes: the Bluetooth MIDI Keyboard popup now has a working close button, which helps live performers and testers who rely on temporary Bluetooth keyboard connections during patching or rehearsals. Together these tweaks show an attention to both pro gigging needs and the everyday GAS-driven patch exploration many of us indulge in.

Synth One J6 remains a free download with optional donations and continues to position itself as an iOS synth inspired by classic hardware analog sounds, nodding to Juno and Jupiter families while blending machine-learning elements to emulate analog characteristics. The instrument ships with more than 400 presets and offers a vintage/analog feel, sequencer and arpeggiator, chorus/delay/reverb effects, AUv3 plugin hosting, and deep modulation routing for complex patches and feedback effects.

Practical steps: update to v0.95.4 in the App Store, confirm your host sends program change messages the way you expect, and map program numbers in AUM or your AUv3 host before a live run. If you rely on alternate A tunings, experiment with the Lock button in rehearsal so you know how preset recall behaves. And back up any custom presets before mass changes to avoid surprises.

The takeaway? This patch is small but focused: better AUv3 program change handling and a robust tuning lock make Synth One J6 more predictable onstage and in the studio. Our two cents? Update, test your host mapping, and enjoy fewer menu dives and more time patching without ripping out your patch cables.