Right this is what I've been told:
DG
You can do this in DP a couple of ways. easiest is to use "Region>Change Duration>Move Releases". This will extend the cutoffs of the selected notes of your first chord up to the attacks of the notes of your second chord. It works with chords or single notes...wahtever you select. Also, there's "Region>Change Duration>Extend Releases" where you can fine tune the extensions a bit. Finally, I sometimes take string pads, quantize their attacks and releases to the duration of the chords, then "Region>Change Duration>Scale" to about 105%, which actually extends the releases over the attacks of the next chord. This gives some very nice legato transistions. Check out the "Change Durations" section in your manual and you'll get a bunch of good ideas.
DG