I'm trying to set up an analog input to my 818v3, for the first time. The manual implies that I just have to plug it in, and then select the source with the Source button or with one of the labeled buttons on the remote.

But it doesn't work. The Source button switches only among the sources I have used, Sooloos and USB.

I assume setting up the Configuration program might help, but that's a hassle, and according to the manual it shouldn't be needed. And I can't find any configuration option on the box itself.

Suggestions?

Music room: 818v3, DSP8000SE, Roon/Intel NUC, microRendu/LPS-1 into Geek Pulse Xfi into Audeze LCD-3
HT: G61R, HD621, MS600, Oppo, Avantgarde Solo
Library: MS600, Bel Canto, Mark & Daniel
Other: SonicOrbiter, GeekOut, Audeze EL-8