Interesting, but if you want to play a whole recording 2x you need to wait half of the normal speed original playing.
Don’t know if everybody knows that kind of records here (I’m used to a french forum) but I did a few things experiencing realtime playing pitch effects (Timestretch off, with a guitar) and simple tricks can be used to stay before the real position of recording, and keep realtime playing :
Pitch down : Pitch = - 12, for exemple, at the beginning of playing
Reverse : Rate - 63, after a while because you can’t play the end of nothing
Lfos on pitch, with Saw, Tri…
Normal play, other pitch values, 7 is 1.5x normal play, - 5, etc…you can mess it with random Lfos or random values, but you can calculate it to return to a sync normal playing.
Hard to handle, but crazier than Pickups! 
Sorry for my english weakness.