Maybe you could change a setting in Roon to allow you to change the volume. There are some options for this.
you can DSP volume control, but feel whatever benefit i gain from not using airplay, would be lost by having to put all music through -Xdb volume dsp instead of controlling volume on the amp itself
Maybe try Volumio? My rpi shows up as an AirPlay 2 device.
@rogan started
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Maybe you could change a setting in Roon to allow you to change the volume. There are some options for this.