It's said that WC is more accurate, but the main issue is what Flo pointed out. Different hardware needs a fine tuning regarding to the latency compensation. I don't measure what I get for ADAT sync without WC here, but there's an audible phase shift. Using one output from the RME and the other from the ADA, the stereo effect is wider. I didn't test, if this will cause serious issues for mixing, especially when the channels will be routed to mono. For Qtractor you at best can be exact to the ms, but even this isn't always possible and a compensation < 1ms is impossible using Qtractor. So it's a serious question, how to compensate latency to get it sample accurate. I don't know what can be done by the RME tools, since my card isn't good supported for Linux at the moment. During the night and morning I installed a XP to do some tests, but I've got issues creating a working graphics driver and Internet connection :(. There are no issues running XP in VBox on Linux, but that doesn't help, for testing the RME hardware and tools. I agree with Flo that the tolerances of your amps and speakers likely is bigger, but since it's a chain, it might add phase shift, even if it shouldn't be audible for the mix, doing the mastering becomes harder, the more similar issues are added. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user