I have the same deck but in black... The problem is that the sound is like oscilating, as if the tapes were bad, the sound goes up and down, it sounds distant... I already cleaned everything that can be cleaned within my reach.
Usually, the pinch roller has to be replaced, it is old and therefore does not guide the tape evenly. But it could also be because of the belt. Or worse, the capstan motor is faulty.
