DSDT - Asus x58 Sabertooth - Firewire performance

Anyone who's worked with firewire and music production is going to tell me to forget the onboard VIA chip and get a PCI or PCIe firewire card build on a TI chipset--In fact that's what I told myself. And I'm a good listener so I bought one only to find that I'm still suffering from the same problems: Very choppy audio coming into the inputs.

I've googled and I've come across this guys who's reporting the same issue:
Tonymacx86 Forum - Firewire Audio interface problems -- Need Assistance IRQ's

He basically figures the problem is related to HPET stealing the firewire's IRQ. It's not clear if he was ever able to completely resolve the issue, but I'd suspect he was on the right track.

I am a noob in regards to DSDT editing, but I'd like to give it a shot. From what I can tell my DSDT (for bios version 1304, downloaded from the database) does not make any reference to firewire and was hoping that adding a reference might improve performance. However I have absolutely no idea of how I'd get or where to look for information about adding a firewire definition to my DSDT.

I'd appreciate any help you can offer or even just links to reference material I could use to learn what I need to do.

Regards,
Rob.

After a LOT of tinkering I solved this same problem by disabling Legacy USB support in the BIOS setup. The HPET issue shouldn't be a problem as long as you're using a decent DSDT. I used Ermac's one.

Disabling legacy USB support will stop you from being able to interrupt the bootloader to enter boot flags, but you can easily switch the setting on again should you need to.

X58 Sabertooth
12GB 1600Mhz
Bios Version 1304
Firewire Sonnet Allegro 800 PCIE (TI)
Powercolor 6850
Lion 10.7.1
i7 980
Prism Orpheus