Hello. my name is mustafa. i bought a product of sony nw-e002/black. but what amazed me is that, while the transitions of one song to another, i hear a background noise/hiss. it is especially very absolute while you are listening it at night. at the volume , it is hearable at the silence of the song (just before the song begins). it is not easily heard when u r listening in a loud place. for ex: in a market or in a school. my question is that is it normal? this problem is annoying me. if i hear it is normal, i ll be glad. if this is not normal, i m going to try to change it. (i had tried anyway before. but the man told me that it is normal. but i had used another sony product, but i didnt hear such hiss) please help me. write me something. my other question is that: it's sound is not so quiet. is it normal too? it is quiet but not quiet enouhgh when compared to other sony walkman NW-E105. with regards sorry for my poor english:(