Yes, the blast mania premix can only be done from the DVD. I have a single disc player. I did the KPC, and you finish with that "low impact high intensity at its finest" where my HR is sky high, so I let my HR come back down into a "normal" aerobic range while I change the discs and cue in the title # for blast mania. I was in no danger of my heart rate falling below 140, believe me.
I like just doing the workouts on the fly because it only occurred to me to do the blast add on while I was in the middle of KPC. I'm always changing my mind during the workout of what I want to do, so I've never bothered with a multi-disc player and trying to cue up the whole workout in advance. I think my creative juices flow best during a workout anyway.
Beth