I have been fiddling around with jemplode, trying to get an automatic "soup" playlist of the most recent tracks I've added. I don't see a way to do it. Is there one?

I tried a playlist keyed on tag of 'created', which almost works, but there doesn't seem to be a way to limit the number of matches, and the order is opposite (i.e. most recent at last position in playlist). Oh yeah, and the titles of the sub-playlists are seconds since the epoch, rather than, say, album name.

I also am interested in setting something like this up.

Wouldn't it be nice if there was a RioDJ function???

There is a weighted shuffle of "most recently added" already built in to the player. You don't need to make a soup playlist for it.