I have an idea
This is an awesome app! I really like the new update. Ive been wanting a bass for a long time. One thing that would also be pretty cool is a ukulele. But you could make it a little bit different. There could be the normal option to play it on the app, but you could also do this: have a case that connects an iPhone to an iPad(not like youre stacking them, more like the bottom of the phone is connected to the top of the iPad) have it so the fret board is on the iPhone, and you can strum on the iPad. Idk, I think that would be a cool idea.
Dangr noodl about
GarageBand, v2.2.1