I'll have to admit I don't use the player for what it was intended, I use two for backing tracks for a dance band. Since my two trusty JE510 MD's started letting me down due to old age, I thought it would be nice to "upgrade" to mp3, and save having to swap discs every couple of mins. The HD5 was the best of a pretty useless selection - I couldn't find a "grown up" MP3 player. I record midi to a standard wav file, then convert to atrac+256, which gives a good enough sound. Pity poor old Sonic Stage can't reliably cope with converting more than one track at a time! Anyway, back to the point, when the PS is connected why does the HD5 have to have a battery, and why must it go into suspend after a couple of minutes, and why can't the backlight stay on longer than 30 secs? Anyone out there done a firmware hack to switch all this power saving rubbish off.