I don't remember whether I posted on this thread before, but here goes:
At the lower right, is an AABB switch. It gets two inputs from my E-cello, one pickup pair for bowing one for pizz. The footswitch makes _one_ of these active at any given time. The rig is split into the bottom half (lead) and the top half (bass).
The bottom half is used for lead cello, mandolin, and guitar. Signal goes through the hum debugger, then through the ADI21 (turned on for cello, turned off for guitar). Then through the Tech21 drive pedal; the left two distortion patches are used for cello, the rightmost one is leveled for guitar. Then into the little passive volume box; when on, the signal is attenuated according to the knob, when off the signal goes through full strength. Therefore I can turn the pedal _off_ for lead boost. Then into the Digitech RP355; I switch banks in this unit depending on whether I'm playing guitar or cello, and have an additional distortion, mod, delay, and wah available there.
The top half is used for electric bass guitar and cello-bass. There is room on the board for a second hum debugger, which I haven't added yet. The signal goes to another ADI21 (on for cello, off for electric bass). Then goes to a dual-band compressor, then into the Digitech BP355. It just happens that preset 1 on the BP355 works just about perfectly for me, so I've not gone far into the programmable options. I do have a gentle chorus and a tube-screamer distortion set up on it, for doing bass leads.
I might remove the dual-band compressor and add an EQ pedal to give me a clean lead boost; I like to boost the mids and highs when doing solos on the bass.
I have another pedal not shown here, it's a dual-channel passive mixer. I take 1/4" outs from both the modeling units into this pedal, and then into a PA power amp and my Acme Low B2 cabs. I can set lead and bass volumes separately with the passive mixer.
XLR outs go from each modeler to the board. That way the engineer can set separate channel level and EQ for my lead and bass roles.
There's a 9V power supply on there to power the 9V pedals and the LEDs in my passive switching pedals. The modeling units and the hum debuggers, unfortunately, require wall power. I could get by powering the modelers with one of the Voodoo Labs AC power supplies, but there's nothing out there that will also power the hum debuggers. I just suck it up and made a tree of short extension cords to plug into the various AC adapters.