Okay, I synced some mp3s on there last night and I don't think they have been compressed down any further; at least I couldn't hear a significant difference whilst listening to them through noise reduction headphones. If I go on to 'Detailed Information' via the options in the Now Playing screen, it confirms that the file is an mp3 and at the original bitrate. The player is only 4gb, so I don't really want to load on lossless (wav/ATRAC lossless) files as they take up too much space. So I think I've come to a compromise; I select the tracks I want from my computer, copy them into a separate folder on my PC desktop, add that folder to My Library in Sonicstage, and sync with the player. Then I delete the files in the desktop folder/My Library and leave the music on the player (so long as the device isn't automatically synced with My Library). It's a long winded process, but I now have a player full of mp3s which is ideally all I need regardless of efficiency. Just a note of comparison though... My iRiver player worked as a drag and drop method via Windows Explorer. All you had to do is drop mp3 files in to the root folder - or any combination of archiving folders for that matter - and then the player acts basically as a portable explorable hard drive when you're on the move. I never used any media player on my computer for syncing, I never had to compress/convert and audio as iRiver provide tonnes of codecs (especially with the ability of using opensource Firmware such as Rockbox). I had even replaced the battery with a much higher capacity battery allowing for about 24hours continuous playback on decent volume! But alas, it was stolen. And I'm not one to rant, honest. I'll make do with my Sony for now.