Having two seperate sliders for Pitch and Speed, not just both in one slider.
As well as having a way to automatically launch a track, when the other track gets to a certain point.
Example- Track 1 will start playing at 0:32 Seconds, when Track 2 gets to 3:26 Minutes.
But dont add an automatic sliding capability for the crossfader for this. Give the user 100% control of which track you can hear. This will also open GREAT doors for cutting in and out of songs that work together.
Please let me know what you guys think!