The answer is "not much"; but there are times with certain devices where it may be the only way to cast what you want to play to the AxiomAir. We would not recommend it as the normal way to use your AxiomAir as Bluetooth has audio compression. At first we thought it would be a reasonably simple add-on as it is built into the Pi but the Bluetooth on the Pi has problems. We have been investigating other options that could also give us aptX, and hope to have one that works well soon. First though we want to finish Spotify Connect and the memorizing of past networks for auto connection when in range.
