Drivers can be downloaded here (latest is better, I've owned one - Multimix 16 Firewire, updated, stable).
http://www.alesis.com/multimix16firewire Problem with the Multimix Firewire could have been overheating issue. I left mine turned ON over night one time in a none air cond environment and next day problem starts (crackle, digital noise). It's repaired now by my dealer. After the repair, it's working great, but since I've upgraded to my current Roland Quad Capture, I've only use the multi mix occasionally for the mixer function, not for recording.