User Audio input and line in audio

Hi all

I am working on a music based game that I am lookin to take into 2 directions. At the moment, I have an audio file that plays and the frequency data is turned into objects that the player can interact with according to the music. I have it to a point where I am happy with how the mechanics and gameplay are all working out with a music file I have put into the scene but want to take that part a bit further.

What I would like to know is if there is any way at the start of the game for a user to be able to select a file from their hard drive and have it load into Unity to be used?

The next part would be to have line in audio coming from an external source and manipulated in real time. For example, as someone on a midi keyboard (or similar device) plays a note, it is audible through Unity and I can use its data to manipulate my objects.

The FMOD plugin from SquareTriangle is said to take mic in but I cant work it out.

Any help much appreciated