Three instruments, built one at a time, documented as they go.
akaBleep
An acid voice and a 64-step sequencer in one window.
v0.4.0 · VST3 · AU · Standalone · macOS 11.0+ · Apple Silicon and Intel · 39 presets
Enzyme
Four lo-fi layers drawing on one shared voice pool.
v1.0.0 · VST3 · AU · Standalone · macOS 11.0+ · Apple Silicon and Intel · 18 presets
i4
One sample, five engines, resampled back into itself.
v0.1.0 · VST3 · AU · Standalone · macOS 11.0+ · Apple Silicon · 5 presets
01
One window, not a rack
Each of these exists because the thing it does was possible already, and miserable. Wiring a synth to a sequencer to a fistful of utilities gets you an acid line; it does not get you something you can perform. The instrument is the part where the wiring disappears.
02
Character over emulation
None of these model a specific circuit. Enzyme evokes the Protein's lo-fi bite with bitcrush, sample-rate reduction and waveshaping rather than reproducing a wavetable engine. The reference is a target, not a spec.
03
Shipped states, honestly
These are at v0.1, v0.4 and v1.0, and the pages say so. What is finished is listed, what is queued is listed, and where a README overpromises against the build, the build wins.