MIDI_ArpTrigger
Sends +5V (or +3.3V for 3.3V boards) pulses on the configured pin (defaults to pin 13).
The MIDI standard states that there are 24 clock messages each quarter note. Hence, the software uses a divisor for the triggered signal.
The default is 24 resulting in quarter note trigger pulses.
A trigger pulse simply raises the output pin for a short time.
To change the divisor there is a simple SysEx protocol which contains only one byte for the divisor surrounded by the 0xF0
as the starting and 0xF7
as the ending marker.