Jem: I'm pretty sure the gen2 version of the 2i2 does direct monitoring in mono only. (This is a 'feature" for home studio multi-track since you want to hear your guitar in both ears while laying down those hot riffs.) I think the gen3 has a stereo/mono switch for the direct feed, but I seem to remember somebody on this list recommending against the gen3 for other reasons?

Perhaps you can configure something on the software side to connect the inputs to the outputs? Sorry, I have no expertise there.

-Zach