- A monosynth based on the Hagiwo $9 VCO and the AS3372 Matrix 12 filter Having purchased some Seeed XIAO RP2040 boards to build a polysynth and not using them, I decided to give the HAGIWO $9 VCO a try on its own. Once I got it stable and nice sounding I decided it would make a good base for a dual oscillator monosynth and this was created.
I modified the Hagiwo code to add an FM/Pitchbend input seperate from the CV so when a CV of 0V or 5V are used the Pitchbend and FM still work with negative voltages. This meant I lost the MOD CV input, but I've mixed the MOD pot and CV together onto the MOD input.
I also added the modifications from clarionut on Look Mum No Computer to add the NeoPixel LED for the wave selection display and PWM for the square wave.
https://www.youtube.com/watch?v=fpNUdnT3NE0
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Specifications
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Dual Wavetable VCDCO with 24 waveforms, AM, FM, etc
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FM Modulation, wavetable modulation, LED wave indicator
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Octave Up, Down, Normal per DCO
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AS3372E pole mixing filter with 16 configurations
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Envelope inversion for filter
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Electric Druid LFO with 16 waveforms
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LFO Clock input
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Electric Druid EnvGen8c envelopes for filter and amp.
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Electric Druid Noise 2 for Pink & White Noise
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Elkyam MIDI to CV converter for MIDI compatability
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Master Tune
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Pitchbend Range control
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MIDI and CV/gate control
- Elkyam MIDI to CV converter, slightly modified for different CV outputs and channel changes
https://github.com/elkayem/midi2cv
- Hagiwo $9 VCO
https://note.com/solder_state/n/nca6a1dec3921
https://www.youtube.com/watch?v=HBtc5oQffu8
- Clarionut for his mods to the VCO for LED display and PWM