SCSI is becoming obsolete now. I've got a very old cheapo SCSI card that came with my scanner many years ago - ISA connection (that old) - free to you if you want it. That was replaced by a "bootable" SCSI card that handles the CD writer, the DVD drive, and the scanner - and very good it is, too.
But most of the external stuff that was SCSI when I built this machine is now USB or Firewire. So if you need to connect the sound device and have an ISA slot, try my old one, else look for a PCI SCSI card on Ebay. Otherwise, don't bother.