I've been reading through various threads on UserTracks, having not taken the plunge yet. (I'm still finding all kinds of gems in existing RealTracks, since I'm just a couple of months into BiaB.) But it still sounds like UserTracks have a long way to go to be close to the functionality and flexibility of Biab-created RealTracks. And I'm not really finding much in either free or to-purchase UserTracks, unless I'm missing a source. I may give a try to Pipeline's Flute "realdrum" that he mentioned.