their laptops that has to be connected via HDMI to the X9 processor,
Are they using Roon? Roon should be wireless network connection.
then using the remote to change the volume.
Roon controls volume of the endpoint within its app.
Got a tablet anywhere you can try to see what you think?
Seems odd that no one has figured out something that works in a simple manner. Surely I'm not the only person that doesn't want fifty-eleven things going on when listening to music.
Everyone carries a computer 24/7 now. Soon everything will be connected to the net and be voice controlled. Not long after music will play directly in your brain bypassing the ears.
Neuralink and the Brain's Magical Future — Wait But Why
I knew the future would be shocking but this is a whole other level.
waitbutwhy.com
But I digress... if you’re willing to keep a pc connected to your audio processor maybe JRiver will work for you? I’m not familiar with using JRiver in this scenario but it does have the 10ft media center type interface and it can be controlled with an IR remote.
Media Center Remote - wiki.jriver.com
wiki.jriver.com
And it costs way less than Roon.