When you select a piece, Metronaut will show a Preview of the piece where you can choose from different versions if available and also personalize the music sheet to your needs.
The Preview you see is chosen based on your selected instrument and level.
You can further adapt the piece by tapping on the settings button next to each version (see Screenshot below) and changing any Transposition Parameters (Interval, Octave, Tunning Reference, Transposing Instrument) or Display Parameters (Clef, Cursor Type, etc.). Your choice of parameters will be remembered each time you want to practice the piece.
Note: When using a transposing instrument (for example Saxophone Alto in Eb) on a piece in a different key (for example in C), Metronaut will actually transpose the Accompaniment Audio and leaving the music score visually intact but in your preferred key.