OK, I've not tried removing extensions from the system->library->extensions folder until now.... I'm working on a project using MAX/MSP and Jitter (one for Audio/MIDI the other for video input). I have a problem in that I need to run both a webcam at the same time as an audio input/output through a sound card (m-audio Delata44). The problem comes when I enable video input, as the webcam (USB) has a built in mic it over rides my delta44 cards drivers. This makes my task impossible! I'm already using a general user webcam driver (http://webcam-osx.sourceforge.net/) so I checked their site for info on disabling sound input from webcams. They said their drivers don't support USB Audio and that it is covered in the Apple native AppleUSBAudio.kext driver. I tried to move it to another folder but it won't let me... I hardly ever use OSX... I'm still stuck in good old os9!! If anyone knows how I can remove/rename/delete the USB Audio extension I'd be hugely greatful. I've got no disks to boot from though cos they're locked in my locker at work and I can't get them until Thursday! (4 more days!) and I took the time off to work on my programming piece. Cheers.