Sends a MIDI all notes off message to all connected MIDI devices. on all channels. Use the port: and channel: opts to restrict which MIDI ports and channels are used.

When an All Notes Off event is received, all oscillators will turn off.

MIDI 1.0 Specification - Channel Mode Messages - All Notes Off

Introduced in v3.0

Examples

# Example 1

midi_all_notes_off

#=> Turn off all notes on MIDI devices on all channels (and ports)

# Example 2

midi_all_notes_off channel: 2

#=> Turn off all notes on MIDI devices on channel 2