You're right IRQ sharing is possible and in most systems is quite fine.
My GFX card is also on 18, but is sharing with my firewire controller. Since I don't use firewire, that's not ever a problem. I've got sharing on 22 and 23 as well, but again, it's nothing that will ever generally cause an issue.
I think most issues with Creative sound cards can be traced back to IRQ sharing and how Windows and your motherboard deal with that. The trick is to put the card in a PCI slot that doesn't share an IRQ with either the video card, or the IDE/SATA controller. Soundblaster cards are notorious bus hogs, especially the newer X-Fi and Audigy 2ZS line.
I've got an Audigy 2ZS installed through 2 different motherboard/CPU combos, and have never had a problem. Research, research....research [img]smile.gif[/img]
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