MATRIXSYNTH: Poly6 Teensy 3.6 based Polysynth with patch memory

Saturday, June 08, 2024

Poly6 Teensy 3.6 based Polysynth with patch memory

video upload by Craig Barnes


This is a polyphonic synth forked from albnys/TeensyPoly6 converted into a 2U 19" rack.

The analogue interface now uses 6 MUX chips to read the pots and switches so there is no need to connect top the top or underneath of the Teensy 3.6 for the extra analogue inputs required. It runs smoother now as well.

The schematics are upto date now with the latest mux changes.

The synth is built using a teensy 3.6 overclocked to 192Mhz and is programmed in Arduino IDE using the teensy audio library.

Easily upgrade to a T4.1 or even a T4.0 as very few connections are required now. Increase of polyphony is probably available with a T4.x.

How it sounds in the original keyboard form, this sound engine is unchanged.

• Homemade Polyphonic Synthesizer! [posted here]

Triple VCOs with octave +/- shift.

Osc A with SAW, PULSE (PWM) and TRIANGLE waves, plus SUB and Crossmod

Osc B with SAW, PULSE (PWM) and TRIANGLE waves, plus tuning, oct +/-

Osc C with 28 waves, plus tuning, oct +/-

LP/BP filter with resonance and env +/- for A/D/R


Modulation destinations for FM. TM and AM

LFO attack, decay and sustain with depth control

PWM LFO with rate and depth

Digital reverb with size and mix amount

Digital delay with time and mix amount

Programmable ranges for Pitch, Modulation and Aftertouch

Mono, Poly and Unison (two voices) modes, Unison detune ranges

Note priorities for Mono and Unison modes, Top, Bottom, Last.

MIDI modulation, aftertouch, CC messages for controls, channel change, pitchbend.

999 memories with storage of all front panel controls except volume.

MIDI In, Out, Thru"

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