Hello, 
I've had a near perfect experience with my setup until i installed FCP 6.0 recently. Everything loads up fine but i'm encountering 1 major issue. It seems that audio is always out of sync, when i drag the audio file to the preview window the graphic plays through the audio waves but the audio doesn't actually begin until 1-3 seconds into the song. Obviously this makes things a bit difficult. 

My system specs are:

kalyway 10.5.2

Gigabyte EP35C-DS3R, Q6600, nvidia 8800gts 512mb (via chameleon), 4gb corsair ram. 

I'm using Realtek ALC888A drivers patched by pcwiz in an aggregate setup to run 4 channels (stereo 2x/ quadraphonic)

I read elsewhere that i might have to use a bios patch to enable all 4 cores of my processor, however all 4 cores show up in the device utility altho the processor type is listed as 'unkown', i'm not sure if this will effect anything tho.

Anyhow if anyone has any tips, let me know

Have you tried to convert to aif, seems for audio and FC aif is the best choice. As I understand one should kind of stay away from compressed formats, probably the same for video and audio but I´m not sure. I have two Hackmacs one with the GA P35-DS3R mobo both with the same CPU as you have and in Logic all cores show to work so probably it´s the same with your mobo.

hey mate,

i figured it wasn't the cores i did a few system checks and it's showing that all the cores are active, i must have read an old post or something.

and yeah i'm working with aiffs, they are at 44.1k tho.. should they be 48k for pal? i've also noticed audio scrubbing with the aiffs is almost non existent or verry laggy and inaccurate.

i've also tested FCP 5 and i had the same problems. could it possibly be a ram issue or something? argh this is quite annoying

*bump*

sighs about bumping own post but it's been a few months with no solution in sight