following my own decision (assisted by argos) to keep my hd3 I have now transfered most of my tunes using the original atrac3plus 256 kbps format. hiss.... is definitly there at low volume using the ex71's... also complete lack of bass with these phones.. I hate them almost with a passion now. even the supplied phones (imho) give a clearer sound at low volume. using some cup phones (mdr v300) which incidently cost £35 from comet & less than £20 from john lewis the sound is nigh on perfect... not an ounce of hiss! anyone else had trouble with the ex71's on the hd3 itself i love it... sooooo simple to use (first mp3 player) even sonic stage I found very quick to import a cd and next to no time in transfering to the player.