Switching multiple effects on and off in Boss GT1-B

I picked up a used GT1-B about 10 weeks ago because I didn't want to spend for a used Slow Gear. I only plan to use it for effects live, no preamps, as I like my amp controls and easy on the fly tone changes better than the GT1 preamp settings.

I was wondering how to control multiple effects at once, as well as fully bypass the unit without engaging the tuner. After playing with an FS-6 as CTL2 and 3, I found a neat, easy to use feature that doesn't appear to be well documented or used in the factory patches. I haven't seen it discussed much online.

In Tone Studio, on the CTL/EXP page, we can assign multiple functions to the CTL1, other switches, or expression pedals using ASSIGN 1-6. When enabled we can turn it ALL (up to six items) on or off with one button. It's stored by patch, not globally, so the other patches can still use CTL1-3 as desired.

In effect, it can also be a full bypass switch without switching to a blank unity gain patch.