this post was submitted on 07 Jun 2023
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Very cool. I used to build guitar effects pedals in middle school and high school. I'm going to have to try some of these.
Does he have a list of which ones work with a keyboard? Can they all use a keyboard? And does he have any circuits for converting a midi keyboard into an octave per volt one? It shouldn't be too hard with something like an arduino, right? Just need a way to output a variable voltage.
They run on 1V per octave control voltage. Lots of keyboards can output that natively, the arturia keystep is what I have because it has some sequencing capabilities as well.
There are tons of circuits out there for midi to CV conversion. Arduino is harder than you'd expect because it can't output straight analog so you need to interface with a DAC or filter of some kind. Temperature compensation is also pretty important. Obviously not insurmountable problems, so there are lots of DIY designs of varying quality. Here's the second one I found on a search: https://github.com/elkayem/midi2cv
You can have a really good time with the sound lab mini synth 2 and a sequencer or keyboard. It has 2 voices so you can animate a drone and sequence/play over the top. Or use it to drive spectrally rich audio into a bigger system for processing with mutable modules or whatever. Sky's the limit :)
If you want a relatively straightforward, but still really cool project, the echo rockit is where it's at. Makes a great effect and is still a fun stand alone noisebox.