SympleSynth – for built in sequencers
More information about the SympleSynth:
This is my answer for an Ultra Simple Synth voice for your Baby 10 or other sequencer build. It’s designed to be EASY to build and uses the absolute minimum of parts for its functions. It was a response to so many people building Baby 10’s and using them to make terrible sounds with 555 circuits. 
You know who you are.
This will make music/noise/sound with anything that outputs a CV (Control Voltage) (1 to 5 volts or so) and Gate or Trigger of a couple volts – for example the SympleSeq DIY sequencer kit. You could even plug your vintage analog synth keyboard or Ribbon controller into it if you want – but don’t expect 1 volt per Octave. This IS a very crude VCO, VCF and VCA approximation on one small PCB with about $15 worth of parts (much less if you shop smart)
Top two knobs are Filter cut off and Filter Res, second two are Attack / Decay, Red knob is VCO 2 pitch, and the switch chooses VCO1, VCO2, or Both
This is recorded direct into the computer – no processing.
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