Hello!
I glanced through the downloadable manual and I watched the Michael Nelson video, and I understand that if you have a head with an effects loop (or a preamp pedal etc.), you can send to the effects loop in of this device.
But if you have a traditional head w/o an effects loop or a line level out: Would you need a dummy load or something else with a line out to feed the signal from your amp head?
Related question: The GPDI/IR is a “tunable reactive load” which implies I can take speaker out from a traditional head like a PowerStation does, but I didn’t see that in the manual. Perhaps I overlooked it. But a reactive load means feeding it from an amp head, right?
(EDIT: I don’t think ‘reactive load’ for this device means what I wrote above. From the manual:
The integrated reactive load isdesigned specifically for the GPDI One-Watt output stage and the output transformer driving it. This purpose-built load is automatically engaged when no speaker cable is connected to the Speaker Out jack")
So you’d still need something to take the speaker out load from a traditional head besides this device.