Anybody know of software that can change the speed of the music in real time?
What I mean by this is not to load it into audacity, change the speed and then save as "music-5" for say 5% slower etc
Want at least plus or minus 10 percent but preferably plus or minus 20 percent
Do not care about the pitch changing as this purpose is for dancers to change music to the correct speed for practicing or learning new steps or competitions etc
Of course retaining pitch is even better but not essential
Thanks

THanks I stumbled across that one myself and have downloaded it.
Got some strange effects when changing speed too quickly but other than that it works great.

I also discovered that latest windoze media player (10,11) has variable speed too now - click on now playing, select now playing options, enhancement
it is hard to get the speed though as it is not finely graduated on the slider

Hopefully apple will notice that and add it to next iTunes update :-)

Quicktime has for years a tool for time stretching in real time, it's hidden in the developer tools… (install Xcode)

thanks for that I will try it