Mbox/PTLE/CPU problems

I found some older threads on this problem. Maybe someone could bring me up to date on this. Got an imac 800 g-4. Something must be wrong in my set-up. I can't even play back a simple 2 track recording w/o the "CPU usage is holding off USB audio" message. I've increased buffer size to the max, taken off all plugins, deleted extraneous tracks, upped memory allocation, paired down extentions, and I still can't get the freakin thing to do anything - record or playback. My head is about to explode. Any suggestions? Thanks in advance.

These links may help... - - -

[ I can't even play back a simple 2 track recording w/o the "CPU usage is holding off USB audio" message. Is the Mbox in its own USB port, not a hub? Dave

[QUOTE]Originally posted by studioindigo: [QB][ I can't even play back a simple 2 track recording w/o the "CPU usage is holding off USB audio" message. Make sure you have Mac OS 9.2.2 installed. Dave

The Mbox in made for the future as of march 2002. Works well on my Ti 667, but the plug in count can be a bit taxing on the CPU... Pasquale

I had a similar problem (with more tracks) until I downloaded the latest Digi USB driver. Since then I no longer get that message and it seems to be running fine, so if you haven't got the latest driver I recommend getting it. I also updated the firmware, but I think it was the driver that did it. J

Thanks for all the suggestions. I believe I have 9.2.2 installed, came with the imac (just got it a few months ago). I did update to the latest USB driver, as well. I need to trim the extensions some more, as most of them are not needed under OS 9. I only use 9 for PT. Am using 10.1.5 for everything else. Which brings me to a question. Could using OS 10 have something to do with my problems? Actually, I first installed PT while booted in 10. When that didn't work, I re-installed it under 9.2.2. That worked fine for a few days, then started going kablooie on me. BTW, I've never been able to run PT under the OS9 compatablity layer in OS10. Should I be able to?