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Head-to-head · AI Harmony Generators

Echelon Audio VOICES vs Eventide Quadravox

  • Updated Sep 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Echelon Audio VOICES #3 in AI Harmony Generators 6.6/10 From $17.99/mo · 7-day trial ✓ 2 of 5 features Visit Echelon Audio
Eventide Quadravox #8 in AI Harmony Generators 6.4/10 From $49 · 14-day trial ✓ 2 of 5 features Visit Eventide

Echelon Audio VOICES leads on 1 check, Eventide Quadravox on 0, and 4 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreEchelon Audio VOICES · 6.6/10

Echelon Audio VOICES scores higher on our rubric for ai harmony generators: 6.6 against 6.4 out of 10; our editors rank them #3 and #8.

Echelon Audio VOICES leads on maximum harmony voices: 8 voices versus 4 voices.

Echelon Audio VOICES is the better fit for DAW users who need up to eight live voices. Eventide Quadravox is the better fit for producers wanting compact, editable four-part harmonies.

  • Echelon Audio VOICES fits best

    DAW users who need up to eight live voices

  • Eventide Quadravox fits best

    Producers wanting compact, editable four-part harmonies

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Side by side

Feature Echelon Audio VOICES 6.6/10 Visit ↗ Eventide Quadravox 6.4/10 Visit ↗
At a glance
Editor score 6.6 6.4
Ranking #3 in AI Harmony Generators #8 in AI Harmony Generators
Best for DAW users who need up to eight live voices Producers wanting compact, editable four-part harmonies
Pricing model Paid Paid
Starting price $17.99/mo Not published
Free plan — —
Free trial — —
Free trial length 7 days 14 days
Deployment Desktop Desktop
Platforms Windows, macOS Windows, macOS
Integrations 7 integrations 6 integrations
Built for Solo, Small business Solo, Small business, Mid-market
Features Echelon Audio VOICES 2/5 · Eventide Quadravox 2/5
Key/scale detection ✓ ✓
Humanisation controls ✓ ✓
Web app — —
Live processing Not published Not published
Harmony stem export Not published Not published
Specs
Maximum harmony voices 8 voices (best) 4 voices
Plugin formats AU, VST3, AAX AAX, VST2, VST3, AU (macOS only)
Our review
Pros
  • Up to eight simultaneous, humanized harmony voices
  • Per-voice stereo spread, tightness and vibrato controls
  • AU, VST3 and AAX support across macOS and Windows
  • Adjust level, pan, delay, feedback, pitch, and interval for each voice.
  • Place notes over time in the staff-based Notation Grid.
  • KeyLock, MixLock, micro-pitch variation, and DAW tempo sync add control.
Cons
  • No free plan; the trial lasts seven days
  • Requires a compatible desktop DAW and iLok licensing
  • Perpetual license costs $149, above lower-cost alternatives
  • Generates a maximum of four harmony voices.
  • Requires a supported Windows or macOS desktop setup.
  • The Quadravox plan is paid, with a $49 one-time price.
Our verdict

Echelon Audio VOICES is a vocal-harmony audio plug-in for music producers and engineers working in compatible digital audio workstations. It reads the song key and generates scale-aware harmony parts in real time, stacking up to eight…

Read the review →

Eventide Quadravox is a desktop plug-in that generates up to four diatonic pitch-shifted voices from incoming audio. Musicians, songwriters, vocalists, and producers can use it to build harmonies or rhythmic sequences around a chosen key…

Read the review →
  1. Echelon Audio VOICESAI Harmony Generators 6.6From $17.99/mo · 7-day trial
  2. Eventide QuadravoxAI Harmony Generators 6.4From $49 · 14-day trial

Strengths and trade-offs

  • Echelon Audio VOICES — where it wins

    • Up to eight simultaneous, humanized harmony voices
    • Per-voice stereo spread, tightness and vibrato controls
    • AU, VST3 and AAX support across macOS and Windows

    Where it doesn't

    • No free plan; the trial lasts seven days
    • Requires a compatible desktop DAW and iLok licensing
    • Perpetual license costs $149, above lower-cost alternatives

  • Eventide Quadravox — where it wins

    • Adjust level, pan, delay, feedback, pitch, and interval for each voice.
    • Place notes over time in the staff-based Notation Grid.
    • KeyLock, MixLock, micro-pitch variation, and DAW tempo sync add control.

    Where it doesn't

    • Generates a maximum of four harmony voices.
    • Requires a supported Windows or macOS desktop setup.
    • The Quadravox plan is paid, with a $49 one-time price.
  • Echelon Audio VOICES6.6/10 · From $17.99/mo · 7-day trial

    Scale-aware, eight-voice harmony for producers working in major DAWs.

    Visit Echelon AudioFull verdict →
  • Eventide Quadravox6.4/10 · From $49 · 14-day trial

    A $49 plug-in for shaping compact four-part harmonies with detailed voice controls.

    Visit EventideFull verdict →

More comparisons

All AI harmony generators comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026