A/B switching.

I've seen this covered a few times but never in the way I want it set up. I'm trying to find a way to switch between my pure bass tone (straight to amp) and my effects (through pedalboard then to amp) and then port all of it to a PA system. I thought I could achieve this by using an A/B switch but it occurred to me that wouldn't work. So I'm reaching out to all you gearheads who would know a thing or two on how to get this set up.

Info if needed: Amp is an Ampeg SVT 4Pro.
 
As stated by @spufman.
LS-2 would be fine but does a lot that you don't necessarily need.
I'd use one of these :
Loop Pedal Switchers - - 1 Looper (Micro, LED Version) - Loop-Master Pedals
And put more money for a good DI to place at the very end of the chain (I personally use a cab sim -Omnicabsim- that has a DI out for that purpose, since I find the pure bass tone to be too clinical for my taste).
Signal chain would be bass > looper in > looper send > effects > looper return > looper out > DI > amp + FOH
Would that work for you ?
 
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A bypass looper and a DI at the amp will do nicely.

^^^This. Signal goes from bass > loop selector > DI > amp. When you step on the loop selector it adds all of your other gizmos into an effects loop that returns back to the loop selector before continuing to the DI. Easy-peazy. I like the semi-custom loop selectors available from Loopmaster but there are lots of products that take this same approach.
 
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