Multi-Touch Piano for the Unity Asset Store
Can I release this as an app to the App Store?
Yup. iOS is ready for release and you'll need to handle the back button press for Android. What you can NOT do is package this as an app to sell to other developers on sites like CodeCanyon.
When is Windows Phone support coming?
I'm working on a Windows Phone build but unfortunately the multitouch input controls are a bit broken between Unity and Windows Phone at the moment so I'm waiting for a stable version before implementing those features.
Why is there latency on some Android devices?
Good Question. Android has always had issues with touch input latency but it is getting better. Google "Android Audio Latency" for more on this topic than you will ever care to learn.