Youre wanting a mill to cut sound boards.
But from there... its like picking a mode of transportation... you need to go a mile.... bike, motor cycle, car, pickup, truck, tractor, unicycle, walk, run, Ferrari, cavalier... you gotta choose what fits the need and situation...
Accuracy requirements, budget, space, and all sorts of other factors come into play. But I would imagine most people in the hobby side of things would be looking at a hobby machine, like a Taig, Sherline, etc...
But remember, you not only have to have the machine, youll need cutters, tool holders, a means to convert a tone board into Gcode and a way to check things.... sometimes the support equipment is more than the machine. There is a forum called CNC Zone that covers a lot of the hobby CNC stuff (as well as a lot of other stuff). Might be worth a look.
Wade