MXR talk box - I am in an Alice in Chains tribute band and use the MXR. It is powered and just needs the signal. I dropped an effects loop send into the chain and run a 1/4" XLR from send 1 to the box with no return. It works great and doesn't change the tone I have built. I can also engage the volume pedal to kill the FOH and still get the effect to send to the box ala Rotten apple. - Hope this helps someone