Q for any Luxman L-509X owners

Thanks for further details on this. I'll have to check tonight if it works by holding down the button for 1 second.. I don't think I've done a "long press" on the button before but that would make sense!

slightly off topic, what speakers do you guys use with it, and how does the amp sound?

I'm using Klipsch La Scala IIs and in my opinion they're a great match with the 509X. 

The LS IIs already have pretty stunning dynamics and smooth mids, as well as solid control of the bottom end. The L-509X complements all of those characteristics with passages that seem to literally move with dynamic expression. 

Big, spacious, expressive sound... I think you have to hear it for yourself, I wouldn't know what you're benchmarking it against, but for me the La Scala IIs are a pretty great fit for the 509X.

Here's a video I took of the "1812 Overture" with the 509X and La Scala IIs:

https://youtu.be/sB_wChJ0RlI

Also, can confirm the "long press" DOES work for the Separate button on the remote... awesome! Now I can switch over to my CL-40 tube pre without walking across the room.

slightly off topic, what speakers do you guys use with it, and how does
the amp sound?

I'm using legacy focus se and it sounds incredible.