SANDST0RM-1 Background

I wanted to try to build my own analog monosynth.

I wanted it to be programmable via MIDI and store patches, so all synth controls had to be computer-controlled. For this I used digitally controlled potentiometers among other things.

For testing purposes I also decided to add an “manual override” mode (using jumpers) for manual control. For this reason, the synth is more or less a test platform than a proper “product”.

Design was quite heavily based on Sequential Pro-1, but being computer-controlled.

Features

1 x VCO (Curtis CEM3340-based)
1 x LFO (Curtis CEM3340-based)
1 x ADSR Envelope (Curtis CEM3310-based)
VCF (Curtis CEM3320-based)
VCA (Curtis CEM3360)
MIDI interface
Roland PG-200 control interface! Idea was to add a possibility to use my PT-200 to control the synth parameters.