MIDI to CV Converter

This MIDI to CV converter is the perfect interface between your computer or iPad and an analog synthesizer (e.g., see https://www.thingiverse.com/thing:2704888). 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.)

This device has the following features:
* USB MIDI Interface
* 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