I’ve been experimenting with a new app called FingerFiddle and am really having a good time with it. I love how the iPad (or iPhone) can serve as a totally blank slate for creating a musical input device. This app allows for vibrato, bow pressure and stroke simulation, double stops, and much more. I could actually see using it in a lesson in some fashion, and it’s a lot of fun to play around with.
Here’s a demo video, and here’s a link to the app store page.