i also use airPlay for similar convenience reasons.
airPlay is an apple protocol for streaming audio (and other media) over a LAN. so, it really depends upon the specific airPlay-enabled device as to what the I/O possibilities are... but, the salient point is that the device (the MSB renderer module in this case) must be airPlay-enabled.
also, for anyone using airPlay make sure the device firmware is running airPlay2 -- it is a significant up-tick in quality.