I can't seem to get airplay to work with vox, I have it installed on both my MacBook air and mac mini and neither connects to airplay speaker (older airport express used on to receive and connect to amp/speakers) This airplay speaker works with my aTV, iTunes on either computer - actually all other airplay programs on either one. Plus it of course works on my iPhone even using Vox. Actually right now I'm playing VOX airplay to the aTV and the aTV to the Airport express/amp/speakers (I'm still annoyed that apple removed the optical out on the aTV4 and have redone my system to use audio HDMI out)
I select the airport express as the audio option and it switched back to headphone after a moment on both the mini and air. this wasn't a problem in the as I used USB DAC/amp/speakers with the Mini to play the FLAC files not in Itunes (iTunes works perfectly with the AE speakers from the Mini)
Vox wont connect even when the aTV is off (no light) both computer have itunes closed - ie nothing is connected to the AE/speakers. but Vox still switches away from airplay to the AE when selected on both computers.