Hi there,
i am currently developing a little project, just a loopstation to control with a gamepad, mouse/keyboard or an arduino with buttons connected 
Just very early development snapshot, so much of the functions are not available, but there is already a little playground in there
You would do me a favour, if you test it out and send me some feedback
what i really need are some hints to dive into system near (C# libraries) which i can use for performant audio control, now i use the system stopclock, but at higher BPM Speed it seems there are a few laggs with the audio playback
i know, that unity may not the right decision to make a loopstation 
but if everything works fine, this will grow into a nice multiplayer jump&run with one player sings or makes nasty tones and the other player has to walk over the waveline or something like that
http://www.daspete.at/projects/sloopy
have a nice time
Das PeTe