I used to have an ensoniq vfx sd1 and the sequencing was very similar to what you describe. You could break up a song into verse bridge etc, then on the fly in real time put it together any way you want.
I never saw anything like that on the psr 3000 or tyros but there are alot of guys here with a lot more experience than me.
Have you tried a computer sequencer? powertracks pro ( pgmusic.com) is what I use.
In power tracks you can make what they call "scraps" and then string them together. You can name and save the scraps and then load them back up with the save scrap and load scrap commands. Thats the closest I've found to what I think you are talking about. A few years ago I decided I was going to stop spending all my time learning new software so I stuck with what I already knew about, there is alot of new fancy stuff out there but powertracks serves my needs and wants.




[This message has been edited by mikeathome1 (edited 09-02-2007).]