If the speakers are plugged into the output of the motherboard's built in soundcard, then there is no way that any audio from the outrigger USB sound device can be heard.

You would need powered speakers, attached to the Line Out of the 25EX in order to do that.

I think you are in over your head, given what you've already told us (and what is likely left out) -- but you might try not using the audio of the 25EX and simply try plugging the audio outputs of the 55 into the Line inputs of the motherboard's soundcard, see if you can use that.

First things first.


--Mac