When recording to Dxi, is the sound card irrelevant or bypassed? Another way of asking my question, does the quality of the output sound when recording to Dxi depend on the sound card, or does it depend only on the Dxi?

The reason I am asking this is: I like the real tracks and midi as recorded via the Dxi, if the sound card is not relevant in the process, then I DONT have to buy an expensive sound card.

thank you for any reply.