Wow! Very much looking forward to this. Thank you!
I hope perception of my appreciation will not be diminished if I confess to just having a couple more ideas/comments here (for any future point) -
1. Being able to set a count for repeats before new generation would be helpful. Sort of like asking a pitcher who is facilitating your batting practice to "Please give me 3 chances to hit that signature fastball of yours, and then let's try the curveball.". So, say, x1, x2, x3, or x4 here (after which you've failed the pop quiz!, to mix my metaphors).
2. Then there is the truth that the number of repeats necessary for a practitioner to duplicate or internalize a given phrase will vary and is unknowable in advance for each phrase. A work-it-until-you-get-it (or give up) paradigm (rather than a "got-it or didn't" quiz) would be I think best supported by a one-touch keypress that says "OK, move on now".
Again, thank you very much for entertaining the idea and adding support for this use case.
I love Rapid Composer!