PhaseThree

Name: PhaseThree
Price: 29 USD
Author: Audio Damage

by Audio Damage · Modulation · Dual phaser (Mu-Tron Bi-Phase model)

Not rated yet

PhaseThree is a digital model of the MuTron Bi-Phase dual phaser, with both channels, the vactrol response and the LFO sweep modeled.

It adds a 12-stage option per channel and models the expression pedal as an assignable parameter, for $29.

Best for: Guitars, Keys & Synths, Drums, Sound Design. Genres: Rock & Indie, Electronic & EDM, Jazz, Acoustic & Classical, R&B & Soul.

Keywords: phaser, drums, keys, synths, hardware emulation, electric guitar, resizable UI, 70s, AUv3/iOS, classic, deep, extreme, mixing, modulation matrix, modern, sound design, pads, vintage, wide.

What it does

PhaseThree is Audio Damage's model of the Mu-Tron Bi-Phase, which the developer calls "one of the most coveted phaser units ever made". The team analysed an original unit's LFO sweep and vactrol response, then added a 12-stage option and tamed some of the hardware's more extreme behaviour.

Two phasers: both channels of the original dual-phaser unit, each with its own LFO, modeled in full.
Vactrol and LFO character: the modeling covers the light-dependent resistor (vactrol) response and the distinctive shape of the Bi-Phase's LFO sweep.
6 or 12 stages: each channel can run the original 6-stage design or a 12-stage option for a deeper, more modern phase sound.
Expression pedal: the hardware's pedal input is modeled as its own parameter and can be assigned to modulation sources or automated.
Stereo processing: the two channels are processed in stereo, for wide phasing on synths, keys and drums.
Presets and interface: a resizable, vector-based interface and an XML preset manager with copy/paste, shared across desktop and iOS.

PhaseThree launched in 2018. The demo is fully working for 20 minutes at a time and cannot save.

Source: Audio Damage product page

When to use it

PhaseThree is the pick for that one classic dual-phaser sound at a low price. Compared with Arturia's Phaser BI-TRON, which models the same Mu-Tron unit, it is cheaper and adds the 12-stage option. PhaseMistress is broader, with many phaser styles and more ways to shape the sweep, while PhaseThree stays focused on the Bi-Phase. Unlike modulation multi-tools such as ShaperBox 3 or Portal, it does one effect only, which keeps it quick to set up.

Best for: slow, deep sweeps on keys and pads, funky guitar, and stereo phasing on drums and synths.
Genres: funk, soul, jazz, psychedelic and progressive rock, and electronic music.
Look elsewhere if: you want many phaser styles in one plugin (PhaseMistress), flanging as well (Instant Flanger Mk II), or a full modulation toolkit (ShaperBox 3).

What producers say

There are few in-depth reviews; roundups treat it as a faithful Bi-Phase recreation.

Pluginerds named it the best dual-stage pick in a 2026 phaser roundup, saying it "faithfully recreates the original hardware, including the vactrol behavior".
Criticisms: the same roundup found the interface "can feel technical for new users".

Pluginerds phaser roundup

Where to buy

Audio Damage: $29
Plugin Boutique: $39

Tutorials and reviews

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