Digital pianos with MIDI thru output
prices on 13 models MIDI thru
— an output that allows MIDI signals received at the MIDI input to be "passed" through the instrument — they are output to the MIDI thru output without modification. For MIDI input, see the relevant paragraph (about MIDI signals — in the same place). And the MIDI thru output can be useful for some specific tasks — for example, combining several electronic instruments into one system, with the exchange of MIDI signals between them.
