Developer Rob Kor has released ChugMate, a free zero-latency VST3 doubler aimed squarely at tight, heavy rhythm guitars.
Broadly speaking, generic doubler plugins tend to get the job done on clean tones but fall apart on palm-muted rhythm tracks. You usually end up with smeared transients, and the result pretty much collapses into a washed-out phasey mess when someone listens in mono.
The developer noticed this issue and made ChugMate try to solve it. And this is the second stere-related plugin we’re featuring today, along with PanBlur.
What I liked here is the focus on mono compatibility. A lot of free doublers don’t worry too much about how the result holds up summed to mono, and that’s exactly where doublers on all types of material, not just rhythm guitars, tend to expose themselves.
ChugMate tries to keep the doubled signal translatable to mono when it gets folded down.
There are a few things going on under the hood. Transient Splitting separates the pick attack from the sustain using a fast micro-crossfade, so the initial pick stays sharp on both speakers without click artifacts at the splice point.
Smart Tail Choke handles the silence between chugs by cutting the delayed signal the moment the DI goes quiet, which avoids the staggered “flam” you get from standard doublers when you mute a note.
Dynamic Pivot & Intensity respond to playing velocity, so the doubled side feels closer to a real second take than a static delay would. Rob also included the Smart Grit module, which adds a phase-aware multi-band saturation stage with Tape and Tube modes, intended to fatten the doubled side and trick the ear into perceiving more width.
There’s also a built-in phase correlation meter so you can keep an eye on your stereo image as you work.
The setup is fairly specific. ChugMate has to sit before your amp sim on a raw, mono DI track. The developer notes that it only works with amp simulators, not on already-amped tracks, so reamping is the workaround if you’re dealing with real cab recordings.
The intended workflow is to send the DI to two tracks, put ChugMate on one of them, route the doubled signal to a second amp sim (or a stereo amp sim), and pan the two hard left and right.
ChugMate is currently in beta, and Rob Kor is actively asking for feedback. If you write heavy music in any flavor, it’s worth pulling into a session.
ChugMate is available as a 64-bit VST3 for Windows 10 and Windows 11. There’s no macOS build at the moment, and Pro Tools (AAX) and Logic Pro (AU) aren’t supported. The download is currently shared via the developer’s Reaper forum thread, with no registration required.
Download: ChugMate (FREE)
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Last Updated on May 3, 2026 by Tomislav Zlatic.
