Thank you, Peter. :) I'll be testing it out. I am just on my way out the door, so it won't be until later tonight. Also, thanks for the explanation on the Mutex vs. Semaphores. I think i have a little bit better understanding, I also did some googling on the subject. "I'd read previously that there was an issue with semaphores (hence I expect why JackWASIO had moved to mutexes). However, if they're working better, I'll revert." I had read the same thing. however, while not "platform specific", it may be jackOSX/coreaudio specific maybe? because obviously, The JackWASIO code was revised that way for a reason, right? that's sort of my logic anyway. there must be something different in JackOSX, that exposes issues with semaphores.... anyway, gotta go jordan