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How to incorporate dry signal?

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Hello. I am completely stumped on this. The easy answer is buy another AMT Tube preamp for my pedalboard, but I was hoping that input from folks with more experience could help out here.

So I am using a Twin Cities amp switcher and have a pedal chain running through A and also through B. Before the input I have the AMT tube preamp. The EHX Mono Synth I have in section A hates the tube, and it is the only effect I have running to that amp.

So knowing that I have a dry output from the EHX, is there a combination of loops or cables that I can isolate the tube from the synth without having to just buy a second tube pre and run each after the Twin Cities? I hope I'm writing this correctly.

I never use the AMT tube when I'm using my Boss Metal Zone, but sometimes I am not using the Metal Zone and want to still use the preamp with my chorus on the B side of the twin cities:

tl;dr AMT tube -> Twin Cities -> A EHX mono synth
-> B Metal Zone, Danelectro Chorus

and I need the twin cities to reverse polarity because of the Danelectro Chorus

How do I run the dry from the EHX and keep the tube in that channel without buying another tube? Or is the reason I can't figure it out is because it's not physically a thing?
 
Then I would need to buy two, which is all I was kinda asking about... seems like my question was dead on arrival

bump?
So, to be clear, you want the AMT sound to both amps, but only when the monosynth is bypassed?

I can think of a way I think this would work, but you'd need an additional a/b switcher.

Your signal would go Monosynth dry out>Amt>ABY and then the monosynth wet out and the 'A' output would be switched by the new a/b switcher so that when the monosynth is on you'd bypass the ABY completely to that amp and when it's off you'd just have the amp connected directly to the 'A' out.
 
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