Similar to the MIDI Thru connector on a synthesizer, the ADAT Thru connector on Tango24 provides a buffered copy of the signal presented to the ADAT Input connector. You can use this connector to chain data coming from your computer back to an ADAT tape machine. That way, audio coming from the computer's ADAT output will be converted back to analog by Tango24 or can be transferred back to the ADAT for archiving without recabling.