Mixer & Mix Drive

The mixer sets the level of each source before the filter, in the classic Minimoog style, and adds Mix Drive, a per-voice overdrive that fattens and saturates each playing voice’s combined signal as you push it, giving you dirt before the filter even touches it. Because it runs per-voice rather than on a shared bus, chords saturate more three-dimensionally: each voice’s harmonics are generated independently, so the result never collapses into a single smeared distortion cloud.

The five faders

The mixer has a fader for each sound source. All five run simultaneously; this is not a crossfade or an either-or selection:

Fader	What it controls
Osc 1	Level of oscillator 1 into the mix.
Osc 2	Level of oscillator 2 into the mix.
Osc 3	Level of oscillator 3 into the mix.
Sub	Level of the sub oscillator.
Noise	Level of the noise source.

Because the sources are independent faders (not a crossfade), any combination can be active at once. You can run all three oscillators at full level, or bring in just a whisper of noise, or silence Osc 2 entirely while Osc 1 and 3 play.

Balancing oscillators for character

A few things worth knowing when you start tweaking levels:

• Equal levels do not mean equal loudness. Different waveforms and models have different peak amplitudes. A Unison saw at 50% fader will hit the mix harder than a sine at the same fader position. Trust your ears over the fader positions.

• Detuned layering interacts with the fader mix. When two oscillators are slightly detuned from each other, they beat against one another, a slow volume pulse at low detuning, a flangey shimmer at moderate amounts. Their relative level in the mixer affects how prominently the beating sits in the final tone.

• The sub fader is easy to overdo. At high levels (especially at −2 octave with a square wave shape), the sub can muddy the low end and drive the pre-filter stage hard even before Mix Drive enters the picture. Pull it back until you feel the weight rather than hear the sub as a separate element.

• All five faders are modulation matrix destinations: Osc 1, Osc 2, Osc 3, Sub, and Noise. You can sweep Osc 2’s level with an envelope for a swell, bring the noise in on an LFO for a trembling breath effect, or have the sub duck in and out with an envelope follower.

Mix Drive

Mix Drive is an analog-style overdrive that sits between the mixer output and the filter input. Every voice’s mixed signal runs through it before anything else in the signal path touches it, which means it colours the material that then gets further shaped by the filter.

At its minimum, Mix Drive is a true bypass: the clean signal path is completely untouched, not just quiet. The moment you move it off zero, the drive stage engages. As you push it:

• The low end softens and thickens slightly, rounding off peaks in a way that feels warm rather than harsh.
• Harmonics accumulate across the frequency range, adding grit and presence to the midrange.
• The top end gets a subtle edge, not a fizz, but a livening of the high harmonics that can make a mix cut better through other instruments.

Push it further and the effect becomes obvious: a driven, saturated quality that lives somewhere between tape saturation and the gain stage of an overloaded mixer. This is not a clean gain stage. It responds dynamically to the signal: louder, more complex mixes (multiple oscillators at high levels, high sub content) saturate more heavily than sparse signals at the same Drive setting.

Tip

Mix Drive interacts with filter resonance. A filter with moderate Resonance and Drive pushed up will self-resonate differently when Mix Drive is adding harmonics upstream. Try sweeping Mix Drive with a sustained resonant patch; you will hear the filter character shift as the input gets richer.

Mix Drive before vs after the filter

This placement (before the filter) is the key design choice. It means:

• The filter shapes the saturated signal, not the other way around. Cutoff sweeps through the harmonics Mix Drive added, and those harmonics behave exactly like oscillator harmonics do; they open and close with the filter.
• Increasing Mix Drive makes the filter response feel more dynamic and “pushed”, because the filter is now working with a denser input signal.
• The dirt is per-voice. Each voice saturates independently, which means a chord does not collapse into a single smeared distortion cloud; each voice’s harmonics are generated separately, and the result is thicker and more three-dimensional than a bus-level overdrive would produce.

Caution

If you are adding Mix Drive to a patch that already has Filter Drive up, keep an ear on the overall level as you go. The two stages stack: Mix Drive enriches the signal going into the filter, and Filter Drive amplifies the gain into the filter’s own non-linear stage. Combined, they can move a lot of energy through the voice. Run a note at the loudest velocity you intend to use and check the output meter before committing to a level.

Mix Drive as a sound-design tool

Beyond “add grit”, Mix Drive has a few specific applications worth trying:

• Fattening a thin oscillator mix. A single DCO saw at modest level is clean and a little thin. Push Mix Drive up and the harmonic enrichment fills the midrange without changing the oscillator settings, effectively giving the oscillator more body.

• Overdrive that scales with dynamics. Because Mix Drive responds to the amplitude of the combined oscillator mix, playing harder (with velocity routed to oscillator levels or Osc level in the mod matrix) drives it harder automatically. The distortion becomes an expressive response to how hard you play.

• Pre-filter grit for physical models. The String and Modal oscillators have their own internal character, but feeding them through Mix Drive before the filter adds a layer of saturation that can make a plucked string sound amplified, worn, or wiry rather than pristine.