I have managed to play and record on my Tascam 38, but it works only on Quantegy GP9 tape I received with the machine, somehow it plays the other tapes I have, but when I try to record on them it does not work. I thought that the Tascam 38 would play and record on any 1/2" tape, am I missing something ? One tape I have was new Quantegy 499 type, and another a 900 not used at all. I am thinking of buying some pancakes so, now I am unsure what tape will actually work. I you have some advice guys ?