I tried all these things before I read this post. It made no differnce to my 'stuck notes' issue using USB under heavy CPU load. My TI works great if there is not much other data flying around my PC. Under stress is where USB is the last to get the timing critical info to and from the TI and Virus Control. For heavy mixing I am forced to switch to normal midi cable and unplug the USB.
I use 1 PCI audio card, a Creamware Pulsar, for extra eqs and compression and it usually hogs the PCI bus to a point where it overflows it. Also I have the RME Fireface 800 for AD DA duties, so right there I've got a ton of data churning in and out of my motherboard.
If there was a way to somehow magically get XP to do USB better, like it does Firewire you would get less upset customers.
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