While jogging the other day, I thought of an app that would adjust the tempo of the music to your target stride, and upon searching google, it appears that this already exists on other platforms.
There is Cruise Control on iOS, and Record beater and Running Cadence on android, but I haven't found one in Blackberry World. Has any of the android versions been sideloaded? Surely there is a fellow runner out there who had the same idea as me...