I would like to arrange music to run to, such that the tempo of it increases as time passes.
Slow music is fine at the start, but could be deadly towards the end when my stamina is draining; I need something with a beat then.
The idea is that I choose the tracks and the app helps me arrange them in order of increasing tempo.
Must be free, prefer Widows, Linux ok, Android as a last resort.
MP3, OGG, FLAC; I don't mind converting to suit the app