This application asks for the following permissions on your phone:
WRITE_EXTERNAL_STORAGE - Saving files. To save created music (project and MIDI);
MODIFY_AUDIO_SETTINGS - Allows the app to change the system's audio settings, such as the volume level and the active speaker. Disable audio in the application when an incoming call is received;
BILLING - Google service to make purchases inside the app;
ACCESS_WIFI_STATE, ACCESS_NETWORK_STATE, INTERNET - To check the availability of the Internet and work with it. To download the SF2 library;
RECORD_AUDIO - Allows the application to access the microphone. This is necessary to determine the sequence of notes when to sing melody into the microphone of the phone.