Build Your Own Clone Message Board

I am looking to build my first pedal, and I am planning on starting out with the A/B true bypass looper switch. My question is, when routing FX loops does the pedal switch just between A or B, or does it also switch to an A+B setting? I am looking for the option to run the return of A into the send of B.

I am a bit unfamiliar with the functions of the 3DPT switch. Does it have this 3-toggle functionality? If not, is anyone familiar with a different footswitch that can cycle between these three options?

One switch bypasses both loops (the true bypass switch), the other selects loop a or b. there is no a + b function.

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MasterDelayer/Reverbrador/Ampaholic/TopJacker