Buffered bypass wiring w/ addon circuit

[dondougie]

Hey all,

I'm in the process of building a 3 band parametric EQ with a buffered boost in one enclosure (it's supposed to be kind of a Furman PQ3-workalike to boost my 1W JCM800 for convincing RATT tones at apartment-friendly volumes ) , and I can't quite get my head around how to wire this thing up. I want the boost to be buffered with the eq switchable as an add-on-circuit. I know how to do this with true bypass (http://www.sabrotone.com/wp-content/uploads/2013/01/Addon_after_tb.png) but I'm completely lost here. Is this possible at all with a 3pdt?

On another note, can any of you recommend a clean 1 knob boost for this application? I've built an AMZ boost, but it gets too gritty when pushing my amp...

Thanks in advance,
Andre