If your MIDI system is limited to a GR-1 and a sequencer, connect a MIDI cable from the GR-1's MIDI Out to the external sequencer's MIDI In. Connect another MIDI cable from the sequencer's MIDI Out to the GR-1's MIDI In.

If you are using one or more additional MIDI devices such as synthesizers, drum machines or MIDI effects processors, you will need to use the MIDI connections labeled MIDI Thru. MIDI Thru takes the data that your MIDI device receives at it's MIDI In and passes it, unprocessed, to the MIDI Thru connection. It is possible to "chain" several MIDI units together by connecting the MIDI Out of your controller into the MIDI In of your first slave, then MIDI Thru of the first slave into the MIDI In of the second slave. This procedure can be repeated until all of the MIDI devices in your system have been connected. The GR-1 does not have a MIDI Thru jack so it will have to be the last slave sound module in your system. If you have more than one MIDI device that does not have a MIDI Thru, you may need to add a MIDI Patch bay or a MIDI Thru box to your system.