To put simply, I think it would be pretty cool to have an acoustic guitar or banjo where if equipped, you can use the numbers 1-6 to play each note. Can start in Standard tuning then add the feature to change the tuning. It would play a sound clip of that note when pressed. Chords can be held with 2 or more buttons. Just a random thought. Add something to do while the night passes by. If a window is open, zombies might be able to hear the said instruments.