Saxophone to MIDI: phase 1 -> audio to MIDI

This first prototype uses: Viga Music Tools piezo as a pickup, SecondSound DACO160EVK for audio to MIDI and an Axoloti and MIDI controller to generate the sound.
In this first experiment I try to open up some new possibilities with chords. The Axoloti has 4 buttons attached to trigger unison, major, minor and suspended chords.