The following are appropriate connections when using the "four-cable" method setup with the GT-8:
- Connect your guitar to INPUT of the GT-8.
- Connect the SEND of the GT-8 to the input on your amp.
- Connect the SEND on your amp to the RETURN on the GT-8.
- Connect the L/MONO OUTPUT on the GT-8 to the RETURN on your amp.
After making the connections, be sure to turn on the SEND/RETURN loop in the GT-8: Press the LOOP button so that it is lit.
Note: For detailed explanation of the EXT LOOP parameters, see page 50 in the GT-8 Owners Manual.