Allen & Heath Quad Voice Harmoniser

allen-heath.com · checked 14 Nov 2026

#14 · AI Harmony Generators

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How it plugs in

—Public API

NoOpen source

NoFree tier

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Quad Voice Harmoniser builds multi-part vocal arrangements around a single live performer.

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: allen-heath.com
Price: Not published
Free trial: Not stated
Built-in effects: Built-in Plate Reverb and Chorus process the harmony stack without using additional FX slots.
Compatibility: The harmoniser is available in any of the four RackUltra FX units.
Global Key: The voices can be locked to the console’s Global Key.
Harmony voices: It provides up to four independent harmony voices that follow a specified musical key.
Humanisation: Pitch and Time Variation add randomized tuning and timing offsets to the generated voices.
Interval range: Each voice's interval can be set from one octave below to one octave above the source voice.
Key and scale: The unit lets users select a key and scale, and can follow the console’s Global key and scale.
Live sound use: The product description positions the harmoniser for live production.
Maker history: Allen & Heath says it began in 1969.
Technical support: Allen & Heath directs product technical questions to its Technical Support Centre or local distributor.
Voice controls: Each generated voice has independent Gain, Pan and Formant controls.
Voice gain and pan: Each voice's gain can be attenuated from 0 dB to -40 dB and its pan position set left or right.

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