AuxHarmonizer
Polyphonic Vocal Harmonizer & Side-Chain Processor
AuxHarmonizer is a studio-grade 4-voice polyphonic vocal harmonizer and side-chain processor. Transform monophonic lead vocals into rich choral arrangements, modern vocal stacks, and robotic vocoder chords with intelligent scale detection or real-time MIDI keyboard control.
Where AuxHarmonizer Excels
Engineered for instant vocal depth, lush vocal beds, and expressive keyboard-driven harmonies.
Multi-Part Choral Arrangements
Generate lush 4-part choir backings snapped diatonically to your key. Dial in 3rd Above, 3rd Below, 5th, and octave doubling with independent formant shaping for realistic human ensembles.
Live MIDI Keyboard Harmony
Route your lead vocal into AuxHarmonizer via side-chain and play chords directly on your MIDI controller. Real-time pitch tracking re-pitches your voice instantly with full pitch-bend responsiveness.
Modern R&B Stacks & Prismizer Chords
Craft tight, wide modern vocal stacks with micro-pitch humanize, Haas stereo spreading, and subtle triode warmth to achieve stadium-sized vocal hooks without recording dozens of takes.
Precision Polyphonic Vocal Processing
Every algorithm inside AuxHarmonizer is purpose-built to preserve vocal clarity, timing, and emotional expression.
Dual Track & Side-Chain Routing
Insert AuxHarmonizer directly on your vocal channel for immediate harmony, or place it on a dedicated bus and feed the dry vocal via your DAW's side-chain input to drive harmonies from any instrument track.
Routing: Direct Insert • Side-Chain Bus4 Independent Voice Consoles
Each of the four harmony voices features dedicated mute and solo buttons, ±24 semitone transposition, ±50 cents micro-detuning, ±12 st formant character morphing, stereo pan, and gain control.
Consoles: 4 Distinct Stereo ChannelsLinkwitz-Riley Sibilance Guard
A built-in 4th-order Linkwitz-Riley crossover at 5.2 kHz isolates consonants and vocal sibilants ("s", "t", "ch") from pitch shifting. Preserves crisp, uncolored high frequencies without phase smearing.
Crossover: 5.2 kHz 24 dB/oct Linkwitz-RileyIntelligent Diatonic Scale Harmony
Choose your Root Key (C through B) and musical scale (Major, Minor, Pentatonic, Dorian, Mixolydian, Lydian, Chromatic) with voicing presets for instant triads, 7th chords, octaves, and gospel harmonies.
Scales: 7 Diatonic Modes + Voicing PresetsLive Spectral Pitch & Voice Telemetry
Integrated real-time spectral analyzer displays incoming vocal energy, an active fundamental F0 pitch tracking line, dynamic floating voice badges (V1–V4), and real-time side-chain signal presence.
Telemetry: Live Pitch & Voice BadgesHumanize, Triode Tube & Haas Width
Subtle analog micro-pitch drift and voice phase decorrelation prevent artificial comb filtering. Combine with modeled 12AX7 triode tube saturation and psychoacoustic Haas width for lush, immersive depth.
Warmth: Triode Tube • Haas WidenerParameter Specifications
Comprehensive parameter specifications for DAW automation and preset engineering.
| Parameter | Identifier | Range | Default | Functionality |
|---|---|---|---|---|
| Mode | harmonyMode |
MIDI Driven, Chord / Auto | Chord / Auto | Toggles between incoming MIDI chord trigger and automatic diatonic harmony generation. |
| Side-Chain Source | sidechainSource |
Direct (Main Input), Side-Chain Bus | Direct | Selects whether audio is processed from the track insert or DAW side-chain auxiliary bus. |
| Root Key & Scale | rootKey / scale |
12 Notes • 7 Scales | C Major | Sets harmonic framework for diatonic interval computation in Chord / Auto mode. |
| Voicing Preset | voicing |
Octaves, 3rd Above, 3rd Below, Triad, 7th, 4-Part Choir | Triad | Instant chord voicing intervals applied across voices 1 through 4. |
| Voice 1–4 Shift | v1_shift – v4_shift |
−24 to +24 semitones | 0, +4, +7, +12 st | Individual semitone transposition interval for each harmony voice. |
| Voice 1–4 Detune | v1_detune – v4_detune |
−50 to +50 cents | 0 cents | Micro-pitch detuning for chorusing, thickness, and realistic vocal spread. |
| Voice 1–4 Formant | v1_formant – v4_formant |
−12 to +12 semitones | 0 st | Independent vocal tract resonance adjustment per voice to alter gender and timbre. |
| Voice 1–4 Pan & Gain | v1_pan / v1_gain |
Pan: L100 to R100 • Gain: −inf to +6 dB | Center / 0 dB | Independent spatial placement and output volume for each individual voice console. |
| Sibilance Guard | sibilanceGuard |
0.0% to 100.0% | 80.0% | Blends dry unshifted high frequencies above 5.2 kHz to preserve natural vocal consonants. |
| Humanize Drift | humanize |
0.0% to 100.0% | 25.0% | Applies natural micro-pitch variations and phase decorrelation to prevent comb filtering. |
| Tube Drive | tubeDrive |
0.0% to 100.0% | 10.0% | Drives modeled vacuum tube triode circuit for warm second-order harmonic enrichment. |
| Stereo Width | width |
0% to 200% | 120% | Expands harmony voice field using Haas delay and mid/side psychoacoustic widening. |
| Master Dry / Wet | dryWet |
0.0% to 100.0% | 50.0% | Mix ratio between the untreated lead vocal and polyphonic harmony voices. |
System Requirements & DAW Compatibility
AuxHarmonizer is tested and fully validated across major production platforms.
macOS
- macOS 11.0 Big Sur or later
- Native Apple Silicon (M1, M2, M3, M4) & Intel 64-bit
- AU (Audio Unit), VST3, Standalone App
Windows
- Windows 10 or Windows 11 (64-bit)
- Intel Core i5 or AMD Ryzen equivalent
- VST3, Standalone App
Verified DAWs
Build Rich Harmonies with AuxHarmonizer
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