Old school meets new school.
I wanted to use the WiiM Ultra as a global EQ Processor, to route any C1 source audio through the WiiM to take advantage of the graphic and parametric EQ that is in the WiiM.
Old school in thought, and knowing the C1 has a so-called External Processor (aka, another tape loop) to route audio.
In short, the WiiM Ultra has Input and Output RCA, just like any old-school EQ. Use it as such!
Insert the WiiM into the External Processor loop. Then, the WiiM can be used as normal, UN-EQ'd source if you will. But if the SOURCE on the WiiM is RCA, then any sound source on the C1 will route. Use the EQ!
Purists scoff! I dont care. My hearing is far from purists these days. I am looking for flexibility, to use what the WiiM has to offer. You choose!