Moog Mavis User Manual (PDF / product page)
The Moog Mavis is a compact semi-modular analog synth voice that can generate a surprising range of melodic material on its own or as part of a Eurorack system. From the manual, its key melodic building blocks are:
Below is a practical analysis of how these modules work together specifically for melodic synthesis.
At its simplest, Mavis already contains a normalled melodic signal path:
Keyboard / external pitch CV → VCO → VCF → VCA → output
And for note triggering:
Keyboard / external gate → EG → VCA
This means Mavis naturally behaves like a classic monosynth voice. For melody writing, this gives you three essential layers:
This is the foundation for basslines, lead lines, arps, and sequenced motifs.
The onboard one-octave button keyboard outputs pitch through the internal routing and also via KB CV out.
Useful melodic behaviors from the manual:
This is unusual and musically powerful. It means the keyboard can act as:
The 1V/OCT input allows Mavis to be driven from any sequencer, keyboard, quantizer, or CV source.
This makes Mavis ideal as a complete analog melodic voice in a modular system.
This gives you: - precise melodic sequences - synchronized timing - classic analog note articulation
The S+H circuit is one of the most useful melodic tools in Mavis.
By default: - VCO is the sample source - LFO is the gate source
The result is a stepped voltage output at S+H out, which can be patched to pitch destinations like 1V/OCT.
When S+H samples a changing waveform, it outputs discrete voltage steps. Those steps can become pitches when sent to the oscillator pitch input.
Now the oscillator pitch jumps in stepped intervals. If the VCO source waveform is saw, the values vary more continuously and produce broader pitch variety.
Because raw S+H can be too wide or erratic: - use the Attenuator - use KB CV as a transposition source - use the Mixer to combine offsets and pitch voltages
This is one of the best ways to create: - generative melodies - pseudo-random riffs - Berlin-school stepping patterns - experimental lead lines
Mavis includes several utilities that are extremely useful for turning raw control voltage into musical pitch material.
Patch: - S+H out → ATTN (+5) - ATTN out → 1V/OCT
Now the ATTENUATOR knob scales the pitch movement.
This is essential for making random voltages feel more musical.
The ONE/TWO mixer can combine voltages, not just audio. This means it can build more complex melodic CV.
Examples:
This can shift a melodic line up/down.
This creates: - melody plus ornament - pitch drift - interval modulation - semi-random note variation over a structured sequence
The MULT lets one pitch source affect several destinations at once.
Now the keyboard pitch also changes LFO rate. If the LFO is in audio range, this enables pitch-linked harmonic behavior. If the LFO is in low range, it gives note-dependent modulation speeds, which can make melody lines feel more animated.
Pitch CV alone is not enough for melody. The note needs time-shaping. On Mavis, this is mainly handled by:
By default the envelope generator shapes the VCA. This creates note contours:
The VCF MOD MIX and VCF MOD AMT let the EG shape filter cutoff.
This is critical for melody because it makes each note dynamically “speak.”
For melodies, filter envelopes are often as important as note pitch.
Use the VCO modulation section: - VCO MOD MIX toward LFO - raise PITCH MOD AMT
This creates pitch modulation.
For leads, subtle vibrato adds life.
If using pulse wave: - set VCO WAVE toward pulse - raise PWM AMT - choose EG or LFO with VCO MOD MIX
This creates melodic tones that evolve over time.
Use: - VCF MOD MIX to choose EG/LFO blend - VCF MOD AMT to define depth and polarity
This can create: - repeating brightness pulses across a sequence - note-by-note contour - syncopated tonal motion if driven externally
A melody becomes much more compelling when timbre moves with it.
One of the most musically important manual examples is using the LFO in audio rate as a second oscillator.
Patch: - LFO out → ONE (-5) - VCO out → TWO - ONE+TWO out → FOLD IN - optionally KB CV → LFO RATE
A second oscillator thickens a melody dramatically: - intervals - beating - richer harmonics - more presence for bass or lead lines
Without the KB CV → LFO RATE patch, the LFO stays at fixed pitch while the VCO tracks the keyboard. That creates drone-against-melody effects.
With KB CV → LFO RATE, both oscillators track together more like a classic dual-osc monosynth.
Mavis is notable for including a wavefolder, and this can strongly affect melodic presence.
Patch: - VCO out → FOLD IN
Now the oscillator is routed through the folder, then onward to filter/VCA.
Wavefolding adds harmonic complexity before the filter. This is especially effective for: - cutting leads - acid-adjacent bass timbres - expressive solo voices - brighter melodic motifs that stay audible in a mix
The manual notes the folder is especially pronounced with saw wave.
This produces a very playable, vocal, aggressive monosynth lead.
S+H doesn’t need to be fully random. It can create rhythmic melodic motifs when carefully constrained.
Result: - a repeating but quasi-random stepped melody
Result: - stable melody pitch with evolving timbral accents
Result: - pitch and brightness move together - creates highly animated melodic lines with internal coherence
This is especially effective for generative music.
The GLIDE control affects transitions between notes.
Because glide also affects KB CV out, it can be part of larger patch behavior if KB CV is used elsewhere.
This makes Mavis good for: - portamento leads - acid-style slides - expressive legato phrases - animated CV interactions
Goal: tight, punchy low-end melody
Suggested setup: - VCO: saw or pulse - Filter: low-pass, medium cutoff - Resonance: low to medium - EG: fast attack, short decay, medium/low sustain, short release - VCF EG: moderate positive amount - Glide: very low or subtle - Optional: wavefolder lightly engaged
Patch ideas: - external sequencer → 1V/OCT, GATE - VCO out → FOLD IN for extra bite - subtle PWM or filter LFO modulation
Goal: expressive monophonic melody
Suggested setup: - VCO: saw/pulse blend - Pulse width adjusted for body - Filter: medium cutoff, some resonance - EG: fast attack, medium decay, medium sustain, medium release - Glide: moderate - LFO to pitch: subtle vibrato - Filter EG: moderate
Patch ideas: - VCO out → FOLD IN - KB CV → MULT - one copy to pitch path, another to LFO rate for note-dependent vibrato speed or dual oscillator tracking - audio-rate LFO mixed with VCO for thicker tone
Goal: self-running melodic component
Suggested patch: - S+H out → ATTN in - ATTN out → 1V/OCT - LFO as default S+H gate - VCO as default sample source - EG with medium attack/decay - VCA in EG mode - S+H optionally also to filter via MULT
Refinements: - slow LFO for sparse melodic notes - faster LFO for arpeggio-like stepping - attenuate pitch range for tonal consistency - use external quantizer downstream if desired in a bigger Eurorack system
Goal: melody against a fixed internal harmonic reference
Patch: - LFO in audio range - LFO out → ONE (-5) - VCO out → TWO - ONE+TWO → FOLD IN - no KB CV to LFO RATE
Result: - VCO follows played notes - LFO stays fixed - creates interval beating and drone tension
This is excellent for: - modal melodies - experimental techno hooks - cinematic motifs
Goal: melody that evolves without changing note content
Patch: - sequencer pitch → 1V/OCT - sequencer gate → GATE - S+H out → CUTOFF or LFO → CUTOFF - use EG on VCF also - pulse wave with PWM
Result: - steady melodic pattern - constantly shifting articulation and brightness - useful for minimalist and modular-style repetition
Here are the most important “musician’s combinations” from the manual.
The basic playable melody path.
Best for: - immediate lead/bass playing - testing melodic ideas - expressive manual performance
Turns Mavis into a full Eurorack melodic voice.
Best for: - sequenced basslines - modular lead voice - DAW/CV controlled melodies
Turns Mavis into a generative pitch machine.
Best for: - random melodies - evolving motifs - self-playing patches
Makes a richer two-oscillator melodic synth.
Best for: - thick leads - harmonically rich riffs - aggressive melodic material
Adds harmonic complexity before subtractive shaping.
Best for: - cutting melodies - expressive solo tones - modern, brash analog voices
Couples pitch with timbre/modulation.
Best for: - melodies that “open up” as they rise - pitch-dependent modulation behavior - more organic phrasing
Result: singing Moog-style mono lead
Result: sharp, articulate melodic bassline
Result: autonomous modular melody source
Result: fuller, more powerful melodic voice
Attenuate if needed via utility rerouting.
Result: higher notes naturally get brighter, mimicking acoustic behavior
From a Eurorack musician’s perspective, Mavis is especially effective for melodic work because it combines:
So it can function as:
If your goal is to create melodic components, think of Mavis in three layers:
Use: - keyboard - external 1V/oct - S+H - attenuated CV - mixed CV sources
Use: - gate - EG - VCA - glide
Use: - waveform selection - pulse width / PWM - filter envelope - resonance - wavefolder - audio-rate LFO mixing
The most musical patches usually come from combining all three layers: - stable pitch source - dynamic envelope - moving timbre
That’s where Mavis becomes much more than a starter synth—it becomes a very capable melodic modular voice.