There's an alarm mode, which lets me pick a playlist to start up with, and a sleep timer, but I can't see an easy way to adjust the volume of one or the other to meet the requirement.
Any suggestions ?
 Many years ago, I used to do this using a timer switch, a dual tape-deck and a CD player - before sleep, I'd put deck 2 in record mode, then pause it - then I could play a CD and adjust the recording volume to quieten it. The timer would turn everything off after a while. In the morning, it would turn everything on at a suitable time, and the tape-deck could be set to automatically start playing from deck 1 - and this was playing at full volume, so could be suitable for waking me up (I can sleep through surprisingly loud music, though - I once had a nap while at a rave).
Original post on Dreamwidth - there are comments there.