Tuesday, February 16, 2016
CB's DIY Modular Synth: 2-16-2016 Arduino oscillator, MIDI, and PT2399 digital delay circuit
Published on Feb 16, 2016 Chris Beckstrom
"More about this project:
http://www.chrisbeckstrom.com/portfol...
This week I built two very exciting modules: an Arduino-based digital oscillator with MIDI input (!!!) and a PT2399-based digital delay circuit. Still working out some kinks on the Arduino oscillator, but for now it has 3 programs, each with a crossfade between different waves. Program, frequency, and wave shape (crossfade) are all voltage-controllable. In addition, the Arduino spits out gate voltages when it receives MIDI note on messages, which I can then use to trigger envelopes, sequencers, etc.
This particular patch is a MIDI sequencer generated by Qmidiarp on linux whose root is determined by the little MIDI over USB keyboard, then sent via MIDI cable to my Arduino oscillator. The output of that goes into an amp (the Arduino is pretty quiet) and then into a VCA whose attenuation is being modulated by the gate voltages. Then into a mixer along with some delay. A triangle LFO is also modulating the frequency of the oscillator (when it's in "free" mode) and a slope generator triggered by the gate voltages is modulating the wave shape (sine to saw, tri to saw, and sine to wave-folded sine)"
FYI, I created a new Chris Beckstrom label for these moving forward. You'll find three previous posts there. A search on Chris Beckstrom will bring them up as well, along with two Bitwig videos. Lots of "New" labels for this post.
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© Matrixsynth - All posts are presented here for informative, historical and educative purposes as applicable within fair use.
MATRIXSYNTH is supported by affiliate links that use cookies to track clickthroughs and sales. See the privacy policy for details.
MATRIXSYNTH - EVERYTHING SYNTH
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