Okay, so I'm planning on purchasing a Dunlop Heil Talk Box in the near future, but I'm trying to figure out if this will work for my setup. At the moment, I'm running through a JCM800 2x12 Combo, and have a vocal mic, which is running through one (shortly two) powered B212A Behringer Pa Speakers.

So, I should be able to run my speaker out to the talkbox, back to my speaker cab, but also use the mic to run into the PA speakers. If, when I stomp "off" the talkbox, the mic should still run as a vocal mic, right?
you have to run the talk box between the jcm800 and it's speakers. Then you have the tube coming from the talk box to put in your mouth.