What is it?

This repository contains the code and schematics for a three-channel USB-MIDI to CV converter. STL files are also included for a 3D printed case. This project has the following features:

Three channel Note CV output (88 keys, 1V/octave, MIDI channels 1-3) using a 12-bit DAC Configurable note priority for each channel (Top Note, Bottom Note, or Last Note Priority) Note scale factor calibration configurable in software 5V Gate/Trigger outputs, where each channel can be independently configured to either output a gate (output high for entire length of time that note is on) or trigger (20 msec pulse each time a new note is initiated) Velocity CV output (0 to 4V) for each channel Pitch Bend CV output (0.5 +/- 0.5V), which can be configured for channel 1, 2, or 3 Control Change CV output (0 to 4V), which can be configured for channel 1, 2, or 3 OLED user interface, used for setting parameters and saving to EEPROM This module is the perfect interface between your computer or iPad and an analog synthesizer. It can independently drive up to three oscillators with 1V/octave CV inputs. (Connection to an iPad requires the USB camera adapter but is well worth it given the wide variety of great MIDI sequencer apps.)

Why did you make it?

What makes it special?