Quick Help
This app can be used as a midi controller, it does not play sound itself. When using the app on an Android device connect it via usb to your computer, swipe down the top menu and select the usb options. There select 'MIDI'.
When using the app for the first time, choose the midi in/out devices in the 'Settings' tab.
Once configured select the 'Monitor' tab to see incoming midi or the 'Keyboard' tab to send midi notes.