Hey Spidey, Nice Avvy !!
I was gonna correct DaveP's assertion about the PCI slot on the AGP bus, but Ole has already done that. clarification - its a bandwidth issue only. the AGP port is essentially PCI, but with various signals removed as you only get one per machine. and since a bus like that can only run at the speed of its slowest part, if you use a 33MHz PCI card in that but it will slow down the AGP to 33MHz (note: AGP 1x is effectively twice as fast as PCI 33MHz - I think this is down to it using falling edges on the clock signal as well as the rising ones. AGP 2x is clocked twice as fast, hence the PCI slot sharing the bus is capable of 66MHz !! Makes sense, just dunno if I am accurate)
This also means if you use something heavy duty in that PCI slot, you will lose AGP performance. so Ole, if your soundcard is 66MHz capable on the PCI side, you should suffer no Graphics performance loss. :-P