That's pretty much it. I was thinking about trying out some of the models in the Helix direct to the return on the custom 50. Since the amp doesn't have a dedicated master volume I guess I would just control level via the Helix. Don't want to run too hot a signal to the return and fry it. If I do this on my other amps the preamp is bypassed but I maintain level control via the master/output. Thanks!