Master Sound in the asset store if you want to buy something. Does everything. You drag the audio onto a playlist, then set the playlist to repeat, shuffle or whatever. You can play sound on button presses, hover and such. Sounds you just drag onto the group area and you can call them whenever. He has a set of playmaker actions (like 40) that you can use. Once you figure it out, really cool and powerfull.
now if you don't want to spend money, then I'm not sure.