JLCooper eBOX GPI8 - Manual (Page 40)

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Currently the Special Tab is not implemented. But even without it
you have the ability to do something like turn on a contact then
delay up to 2 seconds then turn it off again, plus send a MIDI
message to an application, and this can be triggered by a keystroke
that also does something useful in another program, like Pro Tools.
GPI inputs and outputs are separate entities. They may or may not
be connected to the same device. This is why they can be
programmed independently. However, when an input and output
pin is connected to the same device and you want them both to
perform the same actions, you can program the GPI Output pin
first, then click on Apply to GPI In. This will transfer the output
pin’s settings to the corresponding input pin.