The app receives audio but does not convert it to midi.
One suggestion is to uninstall the app and then reboot the iPad or iPhone, Then reinstall it. If this does not work, just post some more info : are you using it as standalone or inside a host app, does it pay the internal instruments and the issue is with the MIDI out, or none of the two are working, etc.
Your suggestion worked!
Man , IOS music making is frustrating. I had to move away from it because of this.