[richiebee]

The Edirol will be fine. Zero latency normally (and I'm pretty sure its the same in this case) refers to direct monitoring - it basically allows you to monitor your input before it gets to the computer, therefore not introducing the latency that your computer adds. It doens't really apply to VSTi's because they start internally. However, latency is usually low enough to play live - as low as a hardware synth in many cases.

Don't worry about the number of channels - when you're playing back, you're just playing back 2 channels (unless you're doing surround). It doesn't matter how many VSTi's you have or audio tracks or anything like that... they'll all route to the two main outputs - a stereo mix. This routing is done by your sequencer.

Rich