It does work now, it just needed a reset. Or, unlikely, the problem was between the chair and the screen. My 210 SL output connected to the SL input of the 218 controles volume of the DSPs connected to the 218. So using the 210 as an endpoint in roon, I can still use the volume control in Roon.
Regards

Main: DSP8000SE< 218 < Farad Super3 TMCB < PS Audio P10. Room correction: Focus Fidelity.
Second: Fostex Fe206NV2 < Audio innovations 500 valve amp < Wiim Pro +
Study: DSP33 < Reviver < MS200
Server: ROCK + Tidal on NUC, fiber on 2x cisco 2960, HD-Plex LPS.
Gone: DSP7200SEu, DSW, DSP5500mkI & DSP5000mkI, 508.20, 210