In ohming out my Amp10B PCB (to figure out how to bridge the amp) I discovered an error on the schematic: the callouts for C100 and C200 are reversed. Taking the board layout as correct (i.e., C200 is closest to the corner of the board), the channel 2 input (J1-4, near the corner of the board) goes through C200 R4 to TAA2022 pin 26. The channel 1 input (J1-1) goes through C100 and R3 to pin 23. The only error is the callout on the schematic: what's labeled C200 shoud say C100, and vise versa.
I had wondered why Jan had used C200 for ch 1 and C100 for ch2. It turns out he didn't.