Hi can anyone tell me the difference between FireWire, USB and PCI-based Audio I/O and what should I choose in case of getting Korg PA1XPro and/or Motif ES?

Also, does anyone knows a good combined Audio-MIDI card? Audio should be 41-48/192.

Is there any special stores that assemble music computer workstations? Or probably it would be cheaper to assemble on your own..

Thanks.

Thank you.

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New Yorker