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

All oscillators will turn off, and their volume envelopes are set to zero as soon as possible.

MIDI 1.0 Specification - Channel Mode Messages - All Sound Off

Introduced in v3.0

Examples

# Example 1

midi_sound_off

#=> Silence MIDI devices on all ports and channels

# Example 2

midi_sound_off channel: 2

#=> Silence MIDI devices on channel 2