Channel changing while boosting

[Keith]

whats up all? Wondering if anyone can help me figure out how to wire up a side switching jack on the isoceles so it can channel change and boost at the same time like the real Fortin pedals.. I wired it up to the switch and got it to boost and change channels but the channel boosted is the clean channel.. Fortin has a slide switch to reverse this order so you boost the dirt channel , I need help to figure out how to reverse it, I tried a spdt toggle switch with no luck