I just recently got GPO and am driving it with Sibelius 3. Other h/w-s/w are: Win2000Pro, 2.4GHz, 2GB RAM, SoundBlaster Live! card, ASIO4all driver.
At 1.25 GB RAM the sounds worked fine with string quartet and harp. But when I tried playing a score with 18 instruments, far less than the 64 maximum, my system choked, popped, jerked, and collapsed in a blast of static. That's what I get when I try to record, also.
So I upgraded to 2GB RAM (max on my motherboard), fooled with every software setting I could find (including CPU Quality in the Ambience. It made the full-orchestra playback worse, and now I get cracks and pops in the string quartet.
Any GPO-Sibelius users have better experience? What's the fix?