How to send a pitch bend MIDI message using arcore?
arcore creator Ralf Kistner provided the answer:

// The pitch bend value is a 14-bit number (0-16383). 0x2000 (8192) is the default / middle value.

// First byte is the event type (0x0E = pitch bend change).
// Second byte is the event type, combined with the channel.
// Third byte is the 7 least significant bits of the value.
// Fourth byte is the 7 most significant bits of the value.
void pitchBendChange(byte channel, int value) {
  byte lowValue = value &amp; 0x7F;
  byte highValue = value &gt;&gt; 7;
  MIDIEvent event = {0x0E, 0xE0 | channel, lowValue, highValue};
  MIDIUSB.write(event);
}