Bungee is our audio stretching library. It can change music tempo and pitch effortlessly in real time on all common devices and browsers.
Bungee is unique in its quality, performance and controllability. Every media player, DAW, video editor should use something like Bungee for smooth scrubbing and audio slomo.
Try it with one click: https://bungee.parabolaresearch.com/bungee-web-demo
So far we have several licensees of the Pro edition with more on the way.