He wrote his own code to handle MIDI (UART) to USB MIDI messages conversion. The interesting part is his use of a 32.15 kbps baud rate even though the MIDI specification requires 31.25 kbps.

The USB-IF's work is a major, and significant, step forward for MIDI 2.0." The original USB Device Class Specification supporting MIDI 1.0 devices was published in 1999.

Android M embraces USB Type-C, MIDI devices Charging and audio features join the existing data transfer protocols. Andrew Cunningham – May 28, 2015 9:39 AM | 41 ...