This will allow a player to plug in a MIDI keyboard or run software to play instruments like the Piano much more easily, thus vastly adding immersion and new interests into the game.
This is a popular and much needed feature in games that use instruments played VIA keyboard which is really not ideal.
Gmod servers and even games like Scum (yes, that DayZ- like Survival game) added this and it turned a neglected feature like instruments into highly gameplay thats even good for things like roleplay.
Just imagine the possibilities in Tower with proper MIDI support!
One example is a video i created in Scum using software to play MIDI files through the game, and its remarkable. https://www.youtube.com/watch?v=50v9cf-sjSI and https://www.youtube.com/watch?v=40SVrLC7_j8
Please consider this as it would be very interesting and bring a new spectrum of entertainment into the game.