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Build a theremin-like instrument as modulation source
So I was thinking about building a theremin. Many ways come to mind how you could use this instrument as an expressive tool in AUM. I was thinking about using Envolver and using the envelope of the theremin signal to influence, for example, a synth's parameters. How cool would it be to add vibrato with a waving motion of your hand? Another possibility would be to use the signal in a vocoder or something like apesoft's sparkle to have fun with it and use it to modulate other sounds.
There are cheap Theremin diy sets that only have the pitch-changing antenna. Still, these have a variation in volume as well when you go to the low frequency end. So you might make use of both the pitch change, but also the signal envelope.
Another, even simpler possibility: Making use of a photoresistor. I have a diy "synthesizer" that can create some basic waveforms. I wonder, if I just shortcut the keyboard and solder in a photoresistor in front of the 3,5mm output, if I'd have something like a theremine-ish device to control volume based on your hand's distance to the photoresistor...
A photoresistor should create a brightness-dependent but frequency-independent dampening of an audio signal, right?
(Maybe you could even build something like a "tone control" photoresistor by sending some of the audio signal through the photoresistor, then a capacitor and then to ground...)
Comments
https://apps.apple.com/gb/app/hands-free-osc-control-music-with-gestures/id1135788686
Provided you have an OSC compatible app...
https://apps.apple.com/gb/app/midi-hand-controller/id1527453317
iOS 14 only. £9.99 to remove time limit.
https://apps.apple.com/gb/app/therimax/id528864495
£1.99 for MIDI output.
There are all sorts of different sensors you can hook up to an Arduino or a Teensy to do a project like this. The Arduino has a library for doing MIDI with and you can use it with a 5-pin DIN connector or USB.
You could use capacitive touch sensors or resistive touch elements (SparkFun and Adafruit have these in various forms). You could use the sonic distance sensors for Theremin like use too.
I've been playing with the idea of using an air pressure sensor to make a CV based wind controller. There are tons of possibilities.
Using the magnet sensor and just holding a magnet is also a very cool idea. And it's got midi out. Nice.
Drambo can use the gyroscope as a modulation/pitch source, I’ve built some theremin-like instruments using that and playing them by moving my phone around. Shaking it can get that vibrato that a theremin gets
Therimax works really well and with the magnet + camera you have 2 mod sources you can use at the same time