These different grooves are all contained within a single CD index point. The manual indicates that index points are available, which allow you go from the different sub grooves within a cut using the index point button on your CD remote. I tried to shift index points to no avail, which I found to be a bit frustrating as you cannot move around the disk as well without them. Many people do not have index commands on their CD players and will never miss this function. Different tracks are divided in different ways.
Some tracks only have one or two variations, or only a single mix being presented.
Others have up to 10 different elements broken out into sub-tracks. This sort of thing is always a bit of a crapshoot, one never knows if there is going to be a version with those great congas broken out or not. Overall though, I think the choices of elements presented were done in a very musical fashion, and with only a single CD of material offered the choices clearly had to be made. I am really very impressed with both the musical performances offered and the quality of the recordings. The grooves are solid, powerful, but float effortlessly.