Turbosounds app for iPad/iPhone, for accordion players. The app was ordered by Reinhard Rieder. Design, implementation, and App Connect setup entirely done by me, in accordance with the customer. You can configure instruments and MIDI channels for your live performance. The app works with AUv3 audio units and CoreMIDI. There are more than 30 instruments and several specific functions available via In-App Purchase. The app is on the Apple App Store since 07/2016 and is still being updated.
http://turbosounds-app.com