[posted] Teensy polyphonic FM synth


Well-known member

I recently started working on making my own synth because I can’t afford to buy one but I have already a Teensy 3.2 with its Audio Board.

So I made a simple polyphonic FM synth, that is also standalone, meaning I can connect my Launchpad to it to play notes without a computer in between.

The setup is really simple, I just have a USB Host chip connected to the Teensy, and then I can plug the Launchpad or any Midi instrument to it via USB.

Here is a demo:

For now I don’t have any potentiometer connected to it to adjust parameters while playing so the envelope and the modulator frequency are fixed but I’m planning on doing that.

I open sourced it on my GitHub. It’s at a very early stage but you can already use it or even contribute:

Let me know your thoughts!
I very much like your approach for patching a polyphonic synth without too much effort. It makes complex synth designs a lot more manageable.
Thanks for posting your code.

Here is finally a complete demo of my synth including raw audio and demos with reverb at the end.

It uses Teensy 3.2 but will be updated to Teensy 4.0 as soon as it is ready for Audio over USB and Midi over USB, I saw it is on beta still.

- FM, AM and Ring synthesis with 1 carier and 1 modulator
- Polyphonic synth, Arpeggiator and Drone modes
- Controllable modulator gain and frequency
- Controllable Attack, Decay, Release
- MIDI over USB
- MIDI through the Hobbytronics USB Host Board Controller
- Audio jack output
- Audio over USB
Love this.

Thanks, this project has evolved a lot since, I developed a modular platform, modular in the sense that the pcb itself is modular, and I created a few modules based of this platform including a new version of SYNTH:



A picture of all modules I built so far:


And I have many videos/pictures, just check the YouTube/Instragram behind those links.

Also the code is available on:
(And again check the other repos on this github for all other modules and for the platform's code)

I'm currently developing the v2 of the platform to improve the performances and make it more compatible with Eurorack. It will now support CV in and CV out, +12v, wider choice of controls for each slot, still using Teensy 4.0. It will be ready in a few months I think... :)