View Full Version : [queued] Teensy polyphonic FM synth

10-04-2019, 01:10 PM

I recently started working on making my own synth because I canít 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 donít have any potentiometer connected to it to adjust parameters while playing so the envelope and the modulator frequency are fixed but Iím planning on doing that.

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

Let me know your thoughts!

10-04-2019, 03:54 PM
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.

10-04-2019, 09:53 PM
Thanks, yes I'm trying to keep it simple

10-10-2019, 10:21 PM
I just added potentiometers to play with a few settings, here is a new demo:

I pushed the code on GitHub again.

12-17-2019, 09:51 PM

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