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Because we want our systems to be available independently and/or together, we are using a Noland expander (which works fine). The expander is important if you plan to install more equipment (later) that

In that case I would recommend the ShipModul Miniplex 41USB. It can work with or without a Mac connected. There is also an OS X configuration tool for it.

http://www.shipmodul.com/en/miniplex-41usb.html