Here is a great site with samples of the basic arabic scales and rhythms, played by real musicians (as opposed to MIDI bits) there is even a video, so you can see how the hands and fingers work, on both Oud and dumbek--Click here

It is from a music and dance performing ensemble at UCLA--where they have a great Ethnomusicology department--they not only collect and study, they teach performance, so it is probably worth e-mailing them to see what they can offer--