Steve, I know this isn't what you asked but I've read your post several times and I'm not convinced that Multi-FX is the way to go. Bin there, dun that, sold it.
In an effort to make their product stand out from the herd, each manufacturer loads their Multi-FX unit with a staggering range of knobs, dials, functions, parameters, etc. and - like most people you only actually need a couple of effects in a whole gig. It's overkill.
I'd suggest you try and find a Pedaltrain Nano and mount on it a decent pedal tuner, an octaver pedal, and a simple synth pedal or maybe envelope filter. Bought new, those four items will cost a fair bit more than a Multi-FX unit ... so don't buy new!
The marketplace on Basschat routinely has half a dozen people having a ***HUGE PEDAL CLEAR-OUT !!! *** so you shouldn't struggle to find what you need.
That will give you a small, light, modular, and above all [i][b]targeted [/b][/i]pedal board which does exactly what you need, no more and no less.
Being modular, if you later decide that you really need a chorus pedal rather than a synth, or you're desperate to try out a different Octaver, then you can re-configure as you please.
Good luck.