In other words is it possible to stream audio from Cubase to a HomePod stereo pair ?
Not directly no, Cubase doesn’t use Core Audio. But, you could probably rig something up with Soundflower or Loopback. Send your audio to Soundflower and from there to Core Audio so it can be sent to Air Play.
Thanks! How would I send audio to t soundflower etc I’m not very ‘technical’ when it comes to this kind of thing.