Bah, this amp doesn't play 100% nice with Macs. I cannot control the volume using system controls through this. It works fine when plugged into my Retroid Pocket 5 (running Android 12 or 13). It won't detect my iPhone and on my Mac Mini, the only way to adjust the volume is using the button on the DAC. I have tried using the app (installed on the RP5) to change from DAC volume to FWD and BACK or just volume.
This is annoying! Granted, it is not something I change minute to minute and I can still mute but it means the wheel knob on my Keychron keyboard basically doesn't control the volume now.