More Info here: sonoclast.com/products/plastic_pitch_midi_microtuner/

The Plastic Pitch is an award winning* MIDI microtuner with an intuitive interface made for experimenting with pitch. Create a custom scale with the twelve black and white tuning knobs, and play the scale with a standard MIDI keyboard or other MIDI controller. The tuning knobs operate at a one-cent resolution and can also be quantized to a Scala tuning. Tune multiple synths and multiple voices simultaneously using the four MIDI inputs and four MIDI outputs.

The Plastic PItch receives input from MIDI controllers and transmits microtuned output to MIDI synthesizers. On the input side, use any combination of an MPE controller, basic MIDI keyboard, or other MIDI source like a DAW or sequencer. On the output side, MIDI tuning is accomplished using MIDI Polyphonic Expression (MPE), basic MIDI pitch bend, and/or MIDI Tuning Standard (MTS)--the tuning method is user-configurable and independent for each of the four MIDI outputs.

The Plastic Pitch is a complex device with many user-customizable options. Be sure to check out the video demos on the Plastic Pitch webpage or our YouTube channel to see examples of how it can be used.

* An earlier prototype was awarded Second Prize at the MIDI Innovation Awards in 2021.