is a USB 2 interface + midi controller suitable for live PA?

[findthesolution]

im wondering if a USB 2.0 interface with a trigger finger hooked upto it would work well enough to route 2 channels of audio into a DJ mixer, and still have low enough latency to drive a midi controller like a Trigger Finger for example. Anyone have any experience with this kind of setup?

[findthesolution]

disregard this. I just found the Echo Firebox2, which is all I need, and its cheap.

[holotropik]

ahhh....firewire?
firewire is what i use, tis sweet as.