Allen & Heath Quad Voice Harmoniser

At a glance

• Editor score
  Not yet scored
• Pricing
  Pricing on request
• Best for
  Quad-series console users needing live harmony effects
• Maximum harmony voices
  4 voices
• Facts checked
  26 Sep 2026

• Where it wins

  • Generates up to four independent harmony voices
  • Per-voice interval, gain, pan and formant controls
  • Pitch and timing variation add randomized differences between voices

• Where it doesn't

  • Limited to the RackUltra FX console effect
  • No VST, AU or AAX format is stated
  • Pricing is available by contacting sales

Our verdict on Allen & Heath Quad Voice Harmoniser

Allen & Heath Quad Voice Harmoniser is a vocal-processing effect in the RackUltra FX range, designed for live performance on supported mixing consoles. It generates up to four harmony voices around a performer and follows a selected key and scale or the console’s Global Key. That makes it a fit for Quad-series console users who want harmony processing within a live vocal setup, rather than a standalone app or conventional DAW plugin.

The controls focus on shaping the harmony stack: each voice has interval, gain, pan and formant settings. Pitch variation adds randomized tuning offsets, while time variation changes the voices’ start and end timing. Built-in plate reverb and chorus can process the harmonies, and Auto Expand adjusts voice-detection expander depth. MIDI control is available for key and scale parameters, which is useful where those settings need to be controlled externally during a performance.

Platform fit is the main constraint. Quad Voice Harmoniser is described as a RackUltra FX console effect, available in any of Allen & Heath’s four RackUltra FX units; it is not presented as a browser tool or a standard VST, AU or AAX plugin. The purchase section has no visible price, and pricing is handled by contacting sales. Choose it if your live vocal workflow is built around a supported console and you want multiple controllable harmony voices. If you need a standalone harmony app or a DAW plugin format, this product is not presented for that use case.

Allen & Heath Quad Voice Harmoniser pricing

Allen & Heath Quad Voice Harmoniser fact sheet

Alternatives to Allen & Heath Quad Voice Harmoniser

• WHWaves HarmonyFlexible eight-voice harmonies with automatic, MIDI and graphic control for DAW workflows.4.4
• AHAntares Harmony EngineA DAW plugin for shaping four harmony voices with detailed note and performance controls.6.4
• EAEchelon Audio VOICESScale-aware, eight-voice harmony for producers working in major DAWs.6.6

See all Allen & Heath Quad Voice Harmoniser alternatives →

Featured on iTechGuides

Allen & Heath Quad Voice Harmoniser is listed in our AI Harmony Generators directory. Add the badge to your site — it links back to this page.

<a href="https://www.itechguides.com/products/allen-heath-quad-voice-harmoniser/"><img src="https://www.itechguides.com/best/badge/allen-heath-quad-voice-harmoniser.svg" alt="Featured on iTechGuides" width="230" height="46"></a>

Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

Advertiser disclosure: iTechGuides is reader-supported. We may earn a commission when you click some links. It never changes a score or a verdict. How we rank.