Attached is the relevant part of the circuit. A trim adjust in the form of a baxandall volume control and the output of my EQ block below it, connected to a JFET soft changeover switch in most part taken from Douglas Self's design. The switch essentially bypasses the EQ block at the push of a button. The reason for DC blocking caps on both outputs is that they are also routed to other parts of the circuit, most notably the CUE bus (also after some switching, CMOS in that case).
To answer the question above, he mentions the necessity to use DC blocking caps as even small amounts of DC can cause switching transients. My EQ design does introduce some DC at its output, which (in my belief) needs to be removed before routing it to the switch.
I tried that approach leaving me with capacitors only directly before switching circuits and in the summing stage of the mixer. When building my first prototype of this circuit I used the combination of X7R and C0G caps (the doubts of their usefulness causing me to make this thread) for DC blocking, which sounded better when compared against some DJ mixers (XONE:92, XONE:96, Pioneer DJM-V10) both when analysed in a DAW and in plain hearing AB tests.
My original question was answered (thank you guys!), yet now I'm very curious to try out Thor's approach of using smaller C0G capacitors with higher resistance FB paths to further improve noise performance
