I want to use Mini Toggle switches to switch on/off NFB and Bypass Cap. 1. Which Mini Toggle do I want - SPST? SPDT? 2. Where do I drill holes in my chassis? I have seen pic’s where they are mounted on the bottom, near the preamp tube socket, and I saw one that was mounted in one of the 2 guitar input jacks. Why does a guy need 2 input jacks right, lol?