Side-chaining is when a signal output controls a parameter of another effect. So in Feral's example the autowah and compressor would have to have a separate input for the sidechain trigger that routes to one of those particular parameters, which in the case of the autowah would be the split dry...
Sorry, you are right. Solid state amps tend to use tanks with a higher input impedance. I don't see it specified in the schematic but from what I see online, other ss ampegs use something like a 4FB3A1C
I think the 4bb3c1b is the wrong tank for it. I think it is supposed to be a 4Ab3c1b. It has a different input impedance.
https://mojotone.com/blogs/news/understanding-reverb-tanks-what-those-letters-and-numbers-really-mean?srsltid=AfmBOorEMLASFsjYPoRgedIYK_lzKEr7_NE0l7Vpm6uTk9WBKkC2BSS0