Hi Dave,
Craig Spinney here, Rob’s partner at Big Music Tent…
I’m not aware of an app that will slow down videos, but on our site if you click on the “Settings” button on any video, a playback speed display will appear where you can choose different speeds of playback for our videos. There is a speed control on the play-along tracks as well. Presently, we are working on a variable speed control for our videos and play-along tracks that will loop as well. That will give much more control than is available now. Stay tuned!
Craig
