for those of you that do require a low latency for your audio routeing, a little known tool called irqballance may help significantly. If i am correct, Fedora Core comes with irqballance daemon pre-installed and I installed it with apt in my debian lenny system, no problem.
For anyone who is wondering, this isn’t the “IRQ ballanceing” option which can be set inside a kernel configuration, that is a deff taboo for low latency. This irqballance is a dameon separate fromt the kernel that helps with irq “prioritizeing”
more info: http://irqbalance.org/