My Little Board seems stable as a straightforward bass board - except I switched out the Mosky Silver Horse for myT-Rex Diva Drive - so I'm playing around with my Big Board:
In signal chain order:
Landlord Cheeky Pint compressor. It's OK, but clips if I push it hard, and running it at 12V doesn't help, but then I don't need a lot for this application. So it's set fairly mild, as a buffer/boost.
Mosky Silver Horse: mild drive / mid boost
MXR Bass Octave Deluxe
Tone City Matcha Cream fuzz. The last three are old standbys by now
Lead Foot volume pedal (at right).
IK ToneX One
That is enough to gig with, but I'm also setting this up to connect to my iPad, through the ToneX One's USB-C interface. I can run the ToneX One with or without direct monitoring: if without, the signal must go through the iPad, which is risky if anything happens to that connection, so I'll probably run it with direct monitoring on. That means that the ToneX will always be responsible for my base tone, even if the iPad connection fails, which is fine. You can use an iPhone too, though mine is pretty old and needs the "Camera Connection Kit" to do anything over USB.
So the iPad can be treated as a mixer send bus, running in parallel, and I won't use it for preamps or processors that should be inline only. I could run in to phase problems if I did. Instead, I'm trying out various modulations, delays, reverbs etc. I'm using the AUM app, which can chain multiple effects plugins, though I might try Audiobus too. To control AUM I have the new switcher at the bottom, a M-VAVE Chocolate, with four controls and the Akai expression pedal attached through it on the left. So far it's worked great over Bluetooth, though cable connection is also an option.
I've tried an effects chain where I can bypass individual effects with the footswitch or control e.g. the rotary speaker speed in Eventide Rotary with the expression pedal. I'm also trying my version of Frippertronics using the Gauss Field Looper plugin,with the switches controlling recording / overdubbing and the expression pedal controlling the speed of the "tape" loop. If anything, I have too many options to play with.