Lumin U1Mini - Leedh + Luxman L-509X

That’s a little confusing because my Lumin Leedh volume control is from 0 - 100dB, with 100dB being maximum volume. Maybe the European Lumin models Leedh volume controls are from 100 - 0dB? Or, technically, 100 - 0dB maybe the actual volume setting, but it does not display that way with my Lumin. As I increase the Lumin Leedh volume up, the numbers increase from 0 - 100dB.

For clarity, I want to use my integrated amp volume control with Leedh while using Lumin as a Roon endpoint. So, the Lumin user manual instructs the user to either determine the preamp unity gain or connect directly to a power amp and conduct Leedh volume control with the Lumin. I can’t find the unity gain for my Luxman.

Will I still get the full benefits of the Leedh volume control technology by setting the Leedh volume to a fixed dB and manage the volume with my integrated amp? Remember, I am using the Lumin as a Roon endpoint, exclusively, and using Leedh simultaneously because I like the Roon interface better than the native Lumin app. Also, we have (3) volume controls in play;

  1. Preamp volume
  2. Leedh volume control
  3. Lumin app Max. volume

What volume do you recommend for the Lumin app Max. volume?

Thanks in advance!

See picture below.