It would be fantastic to have the ability to modulate within an exercise, as well as having the ability to select whether the modulation will be randomized or between specific keys.
Another great option for this would be to use a key signature change for the modulation, or whether it would be presented entirely through accidentals. Both are real-world applications that I see all the time.
Thanks for the feedback! This is one of the music features that we hope to add in the future. We've chalked up another vote and will keep you updated on any developments!
Sight Reading Factory