JLCooper eBOX GPI8 - Manual (Page 36)

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Depending on the type of message you choose, other editing
controls will appear. If the message type you have chosen has a
channel, you can either type a number from 1 - 16 in the Channel
field, or use the up and down arrows next to it. If the message also
includes one or two data bytes, the data byte editors will appear.
You can type a number from 0-127 or use the up and down arrows.
If you check Follows Control, then pressing a button in Live
Mode will cause that data byte to have a value of 7Fhex (127
decimal) and releasing the button will give it a value of 00hex,
In this example, one MMC Command and one Custom MIDI
Command have been assigned to a control.