#1
I was wondering if I could plug the slave out of my single rectifier in a mixer for direct recording instead of micing the cab. Thanks
#4
another amp or
axe fx or
something with speaker/cab emulation.

you can't just capture the signal running out of the amp unless you're going to do some sort of processing on it to have speaker/cab modeling done to it.
Prs se Holcomb is the answer