abacab
And the Gallien-Krueger bass amp from Audiffex is probably better than TH-3 for the bass part. 
https://shop.audified.com/products/gk-amplification-2
 
You can get the GK 2 LE here for free. https://shop.audified.com...tar-and-bass-bundle-le

I have the Markbass Studio, and I like the Ampeg Bass Amps in TH3, so I'm good a range of bass options. I wouldn't be able to run the Gallien-Kruegar into the TH3 looper, so it wouldn't help there.

You can change amps with the looper running. It would have been nice just to be able to pick up another guitar, or have a mic running into a clean channel without having to mess around with changing amps. Maybe I could look into setting up a programm change message from the korg nanopad too.
 
Something I don't see too much of, is two musicians playing into loop pedal at the same time. None of the loop pedals sync with each other.