Hi, I recently got a little Tascam Portastudio Mf-P01 everything works fine besides when i overdub tracks for recording.. there's a loss of signal of the previously recorded tracks everytime that i'm recording or playback before recording..but if i just playback the cassette with the new added record sounds normal..but of course out of time because i couldn't hear the first track recorded. Anybody experienced the same or knows about it? (sorry for my english)