OptoDrum

Some Apps have thousands of hours of programming. This App is maybe 2 hours and cost $5!!! Should 1000% be free. Its rudimentary.

I too had the same problem with Turbo Drum as Camelottt but had she(?) contacted their help desk she would probably have found that her iPad IOS was out of date. Upgrading it to 5.1 was easier said than done and needed a final step of erasing TD then reloading it in order to reset the app directory. Doing this also fixed all the other loaded apps which had stopped working along with the IOS upgrade. Turbo Drum now works as described by the author and is an invaluable aid to neurological disorder

The freezing issue in fact has been fixed. I've tried it on both the iPad and iPhone and it consistently has worked very well.

Cannot change icons or freeze movement once started in current version ! I regret updating !

It's a little tricky but with enough pinching, tapping the top where the icon bar appears, and sliding down on the screen you can change settings. Direction is changed by catching the movement to a stop and dragging slowly in reverse. It works better with young pediatrics than traditional methods of kinetic assessment and therapy, so worth $5!