Theoretically the Iridium does replace an amp and therefore the output should be line out instead of instrument out, but I’ve read in a few threads in another forum that you still need a DI after it. Not sure though, I don’t have a DI to try this out. The only test I did was to run the output of the Iridium to my synth’s input to add some effects and the signal was weak. Not as weak as when I connect other pedals to my synth’s input, but weak nonetheless.