Thanks Mitch,
I am using mostly DV footage and I capture it through a mini DV camera.
I am also using some QT.mov files and a couple of QT from After Effects.
I have final Cut studio 5.1, OS X latest update of tiger and a audio interface.
the system gives me the error window with 2 notes one says droppes frames the other is in red and says soemthing about the RT and the speed of the discs. But I haven’t been able to change that.
Thank you and sorry about my ignorance on the matter.
Paolo