Dual AS3340 VCOs with Auto tune and MIDI
Just a little spin off project from the polyphonic MIDI to CV with auto tune for all 16 VCOs. I thought this might be useful. Instead of a Teensy I’m using a Waveshare RP2040 (Pico) as the MIDI to CV converter and auto tune device. So it’s self contained and takes MIDI in for notes, pitch bend and CC messages. Auto tune is currently implemented as a CC message, but no reason why it can’t be a push button as well as spare pins are available. It will or can accept an LFO of 0-5v and again using CC messages it can control the depth to the VCOs or the filter CV out. Pitchbend depth and aftertouch depth are also controlled by CC messages.
I guess all CVs can be made available, CV1, CV2, filter CV and velocity, plus a gate and trigger, haven’t decided what to do with the 4 spare CV lines, maybe control the PW and PWM depth from an external LFO input etc.
Not finished yet but the MIDI to CV is working fine, the auto tune kicks in on request and sweeps the VCOs in turn in less than a minute.
