Some names came to mind. The company that made the most common software that I can remember seeing was called ENCO; it appears that their current offering in that vein is called MusicMaster[0].

[0] https://www.enco.com/products/musicmaster

I don't remember, it was one of an enormous number of settings in a very complicated piece of software (and a decade ago when I was last exposed to it). The stretching was usually very minimal, on the order of ~10 seconds over an hour, so ~0.3% max (the rest of the timing would be managed by selecting tracks with appropriate lengths).