[asherbro]

>I got some "measurement bad" messages when I was using the built-in mic/speaker inputs and outputs, both on Windows and Mac OS X. When I switched to an outboard USB pre-amp (by M-Audio) those errors went away.

Thanks - I've tried my Echo Mona PCI card, as well as the built-in audio system, with the same results.

>but I'll press on with adapting REW to the Mac in any case and advise when there is a build that works better under OS X.

Thanks so much, John!