Difficulty Casting to Speaker Groups

I activated a pro account trial to test the casting ability of volumio with a raspi and hifiberry Dac + ADC.
So far I’m having an excellent time casting input from a turntable to one google nest speaker. The problem arises when I try to cast to a speaker group; the output will only play on one speaker inside that group. Aside from test mode, which isn’t doing anything, is there anything I can try to remedy this issue? My use case for volumio is entirely based on casting phonograph input to a large google home speaker group.

Thanks for letting us know your use case, which is brilliant!

We can have a look into it, @mervinio can you check ?

I have one more question: is the analog input only limited to 48khz 16bit? I know that the hifiberry is capable of 192khz 24bit. Is there a setting that I can flip to increase the audio input quality?

Thank you!