We’ve seen all manner of complicated synth and audio project based around the Teensy 4.1, and which makes GitHub user phjanderson’s TeensyMix synth somewhat unique. Recreating the 8-voice polyphonic synthesizer requires just an LCD display and digital-to-analog converter, with an optional 5-pin DIN for serial MIDI.

In addition to sawtooth, square, sine, triangle, and sample-and-hold noise, the TeensyMix features several sampled waveforms. There are two oscillators per voice, with waveform shape modulation and frequency modulation (FM) respectively. The PCM5102a D/A converter provides 24-bit stereo audio, with USB-MIDI coming via our USB Host Cable (or optionally serial 5-pin DIN via 6N137 Optoisolator).

Source, hardware pinouts, and usage instructions can be found on GitHub, and you can hear it in action in the video below!