Can I play audio through my Macbook's speakers AND to an airplay device, simultaneously?
Under my volume icon, I have several outputs. If I select my AirPlay device (an Airport Express v2) then audio plays through that device to some external speakers, as expected. My goal here is to simultaneously play the same audio from my Macbook's internal speakers as well, when I do this.
I believe there is theoretically a way to do this under Audio Devices. I've used Aggregate and Multi-Output Devices before, but the method I'm used to doesn't seem to work here. When AirPlay is selected, I can create a new Aggregate Device. I check "use" for both my Macbook's speakers and Airplay. Those devices appear as expected in subdevices/output channels. Then, I switch over to this new Aggregate output under the volume icon. When doing so, the audio plays from my Macbook speakers, but not through Airplay. In fact, the Airplay I checked "use" on greys out and becomes offline. The same is true if I make a Multi-Output device. If I click on the Airplay listing in Audio Devices, there isn't an option to add additional audio outputs to it.
Is there another way to do this so that I can use both outputs at the same time?
I'm on a Macbook Pro running Catalina 10.15.7
MacBook Pro (2020 and later)
