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README.md

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    MUTU – DUAL VCO

    A synthesizer with two oscillators in a mutual relationship with each other.

    Goals

    • flexible sound-generator
    • simple and DIY-friendly
    • eurorack-compatible (CV inputs for FM and VCA, size fits eurorack)

    Non-Goals

    • No perfect tonal tracking intended
    • No features that raise the parts count too much

    Topology

    Interface

    Panel draft with 16 HP (~80 mm wide, 119 mm tall)

    Inputs

    Name Function Normalization
    CV-VCA-A CV-Input for the first VCA. Positive voltages turn up the level of the first oscillator Fixed positive voltage
    CV-VCA-B CV-Input for the second VCA. Positive voltages turn up the level of the second oscillator Fixed positive voltage
    CV-FM-A Frequency modulation (FM) input for the first oscillator -
    CV-FM-B Frequency modulation (FM) input for the second oscillator Signal plugged to the first FM-Input (CV-FM-A)

    Knobs

    Name Function
    FREQ-A Sets the base frequency (pitch) of the first oscillator
    FREQ-B Sets the base frequency (pitch) of the first oscillator. If Track is on, this gets added to the frequency set by FREQ-A
    MOD-A Changes the amount of frequency modulation (FM) the second oscillator applies to the first
    MOD-B Changes the amount of frequency modulation (FM) the first oscillator applies to the second
    ATT-FM-A Attenuates any incoming (external) modulation signal plugged into the input CV-FM-A
    ATT-FM-B Attenuates any incoming (external) modulation signal plugged into the input CV-FM-B. If no signal is plugged into CV-FM-B the signal of CV-FM-A is used here.
    FORM-A Morphs the waveform of the first oscillator between triangle and sawtooth. Might also detune the oscillator
    FORM-B Morphs the waveform of the second oscillator between triangle and sawtooth. Might also detune the oscillator
    LVL-A Sets the level of the first oscillator. If something is plugged into the CV-input CV-LVL-A this knob attenuates the level of the incoming CV-signal.
    LVL-B Sets the level of the second oscillator. If something is plugged into the CV-input CV-LVL-B this knob attenuates the level of the incoming signal.

    Switches/Toggles

    Name Function
    S_TRACK Switches on or off the tracking function where the second oscillator follows the frequency changes of the first.
    S_SYNC Hardsyncs the second oscillator to the first one

    Outputs

    Name Function
    OUTPUT Outputs the summed signal of both oscillators