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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)
<img src="panel/mutu_panel_top.svg" style="width:340px;" />
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### 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 |