Thru box
DEFINITION
A unit with one MIDI In Port and several MIDI Out Ports; each MIDI Out Port has the same signal as the MIDI In Port but with a delay of the signal (usually about 4 ms).
A unit with one MIDI In Port and several MIDI Out Ports; each MIDI Out Port has the same signal as the MIDI In Port but with a delay of the signal (usually about 4 ms).