And now for something a little different: I just put together a second board to go with a computer of some sort, starting with my 2018 Apple iPad:
Harley Benton PowerPlant Tuner / PSU (new)
tc SpectraDrive preamp (old)
Lead Foot volume pedal (new), which is bigger than I thought I wanted, but it all fits in the case and I like it.
Boss MD-200 Modulation (a year old)
Thomann t.mix. MicroMix 2 USB (new)
The mixer acts as a USB Audio interface, in to the iPad via an old Camera Connection Kit (CCK). It can also play back Bluetooth audio from e.g. a mobile phone, for practice. It has to be powered - the iPad can't power the mixer off battery alone. I was concerned I might need a powered USB hub, but I think I avoided that, barely.
On the iPad I'm trying various things. You can do complex audio routing with plugins through an app called AUM. The screen currently shows the AudioKit L7 Live Looper, which is pretty powerful, has pre- and post-loop effects, and runs great on this iPad as a standalone app. It can be controlled entirely by MIDI if you have that option, but I'm thinking of mounting the iPad on a mic stand for easy access. I might run vocals through it too, since the mixer has a mic input spare.
The board needs to be tidied up and some cables need to be improved e.g. the RCA cable with 1/4" adapters is way too long at this point. But it's working and sounds very good so far. With the Bass VI, I'm not exactly up to Frippertronics standard yet, but we shall see!