When I initially purchased my Matrix I bought 2 of them. I mistakenly assumed that it would be as simple as connecting a Bluetooth to get the standalone to work as an external mic. Sadly, it is not like that. You have to program the MV in order to use it with a Pi.
I can see how this may have been important for certain select situations but this is in no way user friendly. Why didnt they make it easy? Had I known about this in the beginning it would have certainly influenced my decision to buy.