I just picked up an AFE in Manhattan yesterday. My XP laptop recognizes the keyboard as a USB Audio Device, but neither AF stand alone nor Abelton Live (nor anything else) see it as a MIDI input device. I've spent a good part of last night and today surfing around to see why this thing isn't recognized as a MIDI input device, and what drivers, if any, are needed to fix this.
All and all, this has been a thoroughly exasperating experince. I'm on the verge of taking this paperweight back to Sam Ash to get my $ back.
There is chatter on the web about dual core laptops and generic XP drivers, and MPU-401 emulations, but nothing (NOTHING!) I've tried has done anything to allow the software to see this thing.