Ingo, very very strange - I believe I checked everything well. From what I read in this forum (I am totally new here since today) there are a lot of different problems for different people... very discouraging to switch to ProTools hardware. But for film mixing stages there aren't 10 choices... So the assistant called and said that I should just swap the connectors of the Rosetta 800 racks connected to the 2 HD cards and that would do the trick. It did. Without knowing why and what was wrong. Thanks Ingo, very kind to reply so fast! I will read the posts here very carefully in the future! - And stick to my beloved Metric Halo interface for my "small" personal work and project preparation :-) Best Jurgen --- In logic-tdm@yahoogroups.com, "ingosand" <mail@...> wrote: > > Hi J�rgen, > > Digi HW can only be used by either ProTools OR Core Audio. > Check your system audio prefs. > Don't use Digi as Core in or out. > > Otherwise, just restart your engine and turn on your Interface before. ------------------------------------