I am running FC 64 bit most of the time. I multiboot other Linux OSs from time to time to make sure my hardware is working right (I'm still breaking in a new pc). I just noticed that my integrated sound card will play 2 channels of sound (1 sound for email while I stream radio) in Slamd64 (another 64 bit Linux OS) but won't in FC4 (I don't hear an email sound while a stream plays). alsamixer shows that both OSs detect my sound as an ATI IXP Realtek ALC655 Rev 0 and both are using alsa 1.0.9. The difference is that Slamd64 is using an x86_64 version of alsa and I don't think FC4 is.
How can I update alsa to a 64 bit version?