Just a point of information for anyone trying the (unsupported) Bluetooth out option.
I bought an appropriate dongle off of eBay for £2.45, but all it did was crash the B2. As others have clearly managed this, I bought another dongle from "a reputable dealer" for about £10, and it works fine.
This forum regularly carries posts about the quantity of dodgy SD cards out there, and it looks like the same comment may apply to BT dongles! You get what you pay for ...
Jeremy