Rockruepel COMP.TWO
by Process.Audio · Compressor · Vari-mu tube compressor
Not rated yet
COMP.TWO models a German-built all-tube vari-mu compressor, with transformer simulation, mid/side and dual-mono modes.
It can also be used as a tube amp stage without compression, and costs $99 (on sale for $59.40 when checked).
Best for: Mix Bus, Mastering, Drum Bus, Vocals, Bass. Genres: all genres.
Keywords: tube, vari-mu, bus processing, glue, bass, dual-mono, mid/side, transformer, drum bus, mastering, visual feedback, vocals, full mix, metering, built-in mix knob, oversampling, piano, sidechain input, smooth, clean, gentle, mix bus, mixing, single-band, stereo-linked.
What it does
COMP.TWO is Process.Audio's model of the Rockruepel COMP.TWO, a German all-tube vari-mu compressor designed by Oliver Gregor as a faster, higher-headroom follow-up to his COMP ONE. The developer calls it "ideal for adding glue to your mix", and says the envelope can run "as fast as an 1176 or as slow as a Fairchild."
- Vari-mu tube design: all-tube compression with no transistor stages, using the same output tube type as the old Altec and EMI RS124 compressors.
- Per-channel controls: separate left and right input, output, threshold, attack, release, dry/wet and sidechain high-pass filter, with an In/Out link button to move them together.
- Stereo modes: Stereo link, Dual Mono and Mid/Side.
- Amp Only mode: bypasses the compression but keeps the tube and transformer colour.
- Transformers: switch the Sowter transformer simulation in for colour or out for a cleaner signal.
- Metering and workflow: dual VU meters, a gain-reduction visualizer, a remote console for controlling several instances, over 80 presets and oversampling from none up to 16x.
The current version is 1.0.3 (September 2026). It was on sale when checked and has a 30-day free trial.
Source: Process.Audio product page
When to use it
COMP.TWO is a good pick for smooth tube glue that can still move faster than most vari-mu designs. Compared with The Glue and the SSL G-Master Buss Compressor, it gives a softer, program-dependent grip with tube colour instead of a punchy VCA sound. MJUC covers several vari-mu flavours in one plugin, while COMP.TWO models one modern unit with fuller stereo options: per-channel controls, dual mono and mid/side. Unlike the Teletronix LA-2A Leveler Collection, it gives you proper attack, release and threshold controls rather than a two-knob workflow.
- Best for: gentle bus glue, drum bus and mastering compression, and smooth levelling on vocals, bass and piano.
- Genres: any; it suits acoustic, pop, rock and soul mixes that want warmth.
- Look elsewhere if: you need fast, punchy VCA-style bus compression; The Glue or SSL G-Master fit better.
- Tip: on buses, use the sidechain high-pass filter to keep the low end from pumping the compressor.
What producers say
The one plugin review we read was very positive about its sound and ease of use and named no real drawbacks.
- Midi Audio Expert (2023) called it "one of the best compressors we've used to date", praising its "incredible sound" and how easily it works on single tracks, drum buses and masters.
- Praised features: the gain-reduction visualizer, the console mode for several instances, the stereo options and the Mix control for parallel compression.
- Tips: use 2x or 4x oversampling if your CPU allows it, and try Amp Only mode on bass and piano for tube distortion without compression.
Where to buy
- Process.Audio: $59 (regular $99)
Tutorials and reviews
- Process.Audio Rockruepel COMP.TWO
- Rockruepel COMP.TWO Plugin: Unbiased Review
- Rockruepel COMP.TWO - Modern tube compressor - Trailer
- How to use Rockruepel COMP.TWO on drums w/ Fab Dupont
- Rockruepel Comp.Two
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