I have a newer DAP1, bought 9 months ago, used maybe 30 shows, worked fine until a day or two ago, it records fine, but now it will not play back the dats it has recorded, it rolls them but according to the meters it shows no recording levels and the machine produces no sound, it appears as though the recorded dats are blank, which they are not (the dats are fine I listened to them after my last recorded show), anyone know the problem here, heads dirty or out of alignment?, the manual says clean the heads, Tascam's tech support number disconnected, help+thnx, Grider