Good Morning All, This company sells a plug and play, into a Raspberry Pi, substitute for a DVAP. About half the cost, $99, and does require software from a third party. Interesting. It is very small and does fit right on a Raspberry Pi. Images available if you Google “DV 3000” http://nwdigitalradio.com/wp-content/uploads/2012/04/DV3000DS.pdf 73’S Mark H. Gottlieb