4Comp: AUv3 Compressor

4Comp re-skins itself to match the compressor you pick. Choose FET, VCA, Optical or Vari-Mu and the whole interface — face, knobs, meters — takes on that hardware's colours, so the plugin feels like the machine you're reaching for.

New in 1.1: tap ? for a quick start and a guide to each model, and watch the live transfer curve on VCA.

FET
Fast gain reduction from a feedback detector, with an all-buttons mode. Hi-hats, drum buses, spiky guitars. Ice-blue face.

VCA
Bus glue with program-dependent AUTO release. Tames transients and spikes without grabbing. Crimson face.

Optical
Smooth, level-dependent release from a modelled photocell — the cell's light memory. Vocals, brass, strings. Electroluminescent-green face.

Vari-Mu
A ratio that rises with level, plus harmonic colour that thickens thin tracks. Mix bus and mastering. Brass face.

Four separate DSP paths
Each model is its own compressor engine rather than a preset over one circuit: feedback FET, two-stage VCA, photocell release, rising-ratio tube. Switch faceplates mid-session and the plugin animates to the new model's look.

Complement it
Stereo link (Linked or Dual Mono), sidechain high-pass, dry/wet mix, input/output and auto make-up gain, a gain-reduction meter styled for each model and 17 presets. Real-time-safe DSP, 0-sample latency by default.
Works in GarageBand, AUM, Cubasis, Loopy Pro and other AUv3 hosts on iPhone and iPad.