Moog — Mavis

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Eurorack Sound Design with Moog Mavis: Modulation Strategies

As a fellow Eurorack modular synthesizer musician, exploring the Moog Mavis as a sound generator in your rack offers rich sonic territory—especially for aggressive percussive hits, basslines reminiscent of dubstep/DnB, and eerie pads. Here’s how to patch and modulate Mavis to wring the most unique and interesting tones out of it, focusing on distortion, motion, and texture.

1. Distorted Percussive Sounds

Key Techniques on the Mavis

Wave Folding: That built-in wavefolder is rare for Moog gear! For hard-edged, biting transients and “crushed” percussive sounds, patch your oscillator directly into the wavefolder (VCO OUT → FOLD IN). Turn the FOLD knob full right for maximum distortion and harmonics.
Envelope Modulation: Use the snappy envelope—set Attack and Release low and moderate Decay & Sustain to taste, triggering with Mavis’ own button keyboard or external sequencer/trigger.
Filter Drive/Resonance: Set the Cutoff high and use Resonance at or near self-oscillation. Try running self-oscillation for “kick” transients.
LFO as Percussive ‘Strike’: Use the LFO in square mode at high rates to make extra clicks or as an envelope retrigger source.
External Audio: With the wavefolder, you can patch in external drum sources, crush them, or layer with internal sounds.

Sample Percussive Patch

VCO OUT → FOLD IN
FOLD OUT (post-wavefolder) is internal to the filter/VCA—adjust FOLD knob
ENV: Attack ~0, Decay ~100-300ms, Sustain ~0, Release ~0
Filter: Cutoff up, Res high OR full (for “pinged” kicks/snares)
ENV → Filter Cutoff Mod (VCF MOD MIX to EG, VCF MOD AMT positive)
Optional: S+H out to Pitch or Filter for glitchy, ‘circuit bent’ hits
Patch GATE IN for tempo-synced percussion, EG OUT to modulate other modules

2. Crazy Dubstep/Drum & Bass Basslines

Key Techniques on the Mavis

LFO as Audio-Rate Modulator: Use Mavis’ LFO at max frequency (audio range, up to ~550 Hz) for deep FM/AM effects and wobble. Patch LFO OUT to PWM or 1V/Oct for dirty bass movement.
VCO Wave and PWM: Use the VCO WAVE knob to blend saw and pulse for richer, nastier harmonics. Modulate PW or PWM AMT with LFO/EG for movement.
Sample & Hold Modulation: Use the S+H to inject random or stepped modulations into filter cutoff or pitch (classic for “robotic”/glitchy bass).
Oscillator Mixing ("Two Oscillators" Trick): Patch LFO OUT (audio rate) into ONE (-5) of the mixer and VCO OUT into TWO, take ONE+TWO OUT as your sound source—FM and sum for richer bass.
Extreme Filtering: High resonance, cutoff modulation with fast or negative EG for squelches and vocal bass.

Patch Example: “Talking”/Modulated Bass

Set LFO to max (audio rate), Square or blended with Triangle.
LFO OUT → PWM IN (Pulse Width Modulation Input)
Set VCO WAVE between Saw and Pulse, modulate PWM AMT for gnarly timbres.
ENV: Short attack, medium decay, low sustain, medium release for pluck or growl.
VCF: Lowish cutoff, high resonance; modulate CUTOFF with LFO and/or EG.
VCF MOD MIX set to blend LFO & EG (find rhythmic sweet spots)
ONE+TWO MIXER: Mix LFO OUT (audio rate) and VCO OUT, then route to FOLD IN
Try S+H OUT to VCO 1V/Oct for pseudo-random ‘wub-wub’ pitch jumps
Glide ON for legato slide/portamento effects

3. Haunting Atmospheric Pads/Textures

Key Techniques on the Mavis

Slower, Moving Modulation: LFO rate low, modulate VCO wave blend, pulse width, or filter cutoff gently to add subtle evolution.
Layered/Stereo Paths: Use the mixer to blend two sources (e.g., Saw and Folded Saw, or VCO and audio-rate LFO); pan externally for wide pads.
Wavefolder for Shimmer: Use FOLD for shimmering/snarling overtones, just barely applied for shimmer versus full-on distortion.
Self-Oscillating Filter: Use high resonance, filter in self-osc mode, play filter with Envelope (VCF MOD MIX set to EG).
Drone Mode: Use the VCA MODE switch ON for constant output (drone), modulate VOLUME, Cutoff, and Fold with slow LFO or S+H.
External CV Control: Patch external slow mod sources or sequencers to filter cutoff, wavefolder, or VCA for motion.

Patch Example: Evolving Pad/Drone

VCO: Set WAVE to desired timbre (CW for Pulse, CCW for Saw, or blend).
FOLD IN: Patch VCO OUT to FOLD IN, only slightly engage Fold for richness.
Filter: High resonance just before self-osc; mad Cutoff modulation.
LFO: Sweep Rate low; OUT to CUTOFF for drifting filter.
ENV: Long attack, long release, high sustain (pad). EG → CUTOFF or VCA CV
Mixer: Try mixing VCO and LFO (slower rate) for evolving undertones.
VCA MODE: ON for held/ambient drones.
Try S+H OUT to modulate CUTOFF for unpredictable, haunted movement.
Patch MULT outputs to send modulations to VCA and filter simultaneously.

Some Patch Combo/Experiment Tips

Chain Modulation: Use MULT for splitting S+H or LFO to several destinations (cutoff, PWM, VCA CV, etc).
Attenuate/Scale Modulation: Use the internal ATTENUATOR to scale aggressive modulations for subtle/organic effects.
External Interaction: Interface with other Euro modules! Use audio-rate CV mod on Fold, Freq, or Filter, or layer sounds with multiple Mavis modules.

Resources

Feel free to ask for more patch ideas or module pairing tips!