I am planing on putting together a rack unit to use as
an effects
processor.
For a sound card I was thinking of
creative audigy2 or is this over kill?
It really depends on the kind of instrument/microphone output and
mixer input you intend to use. You might want balanced XLR inputs and
outputs in a rack unit, mic preamps, or 1/4" jack plugs for an
instrument like a guitar. In that case you could use something like
an M-Audio Delta 1010LT. A DJ could use unbalanced RCA (aka phono
plugs) so an M-Audio Audiophile PCI would do the job.
I figure if it's a rack unit for live use then you don't want to have
any USB or other dongles hanging off.
As this machine is going to spend most of it's
time doing DSP, I
figured more and high speed RAM is good and hence a faster FSB
which I think means a faster processor as well, specially at 400Mhz
for the FSB but is it worth it?
Depends on how many plugins you need to run at once. I can run Jack
Rack on my PII 300MHz laptop with 160MB RAM with a couple of simple
plugins. Your best bet is probably to prototype your selection of
software on a desktop machine before building your rack unit - then
you'll have an idea of the resources you'll need.
Cheers
Daniel