I thought about another way which I think is funnier:
The main character wants to play a certain song, knows the chords she needs to do so, but not how to play them with the "alien" instrument she has to use. But, as written above, she knows the tuning of the instrument.
So, before playing, the player has to chose how to play three chords (without knowing if the selections are correct), and then the character plays the song. There are 27 versions of the song (since it is MIDI, no space problem...) and depending on the three selections, the song will sound better or worse... This may result in a better or worse reputation of the main character.