I've done a few videos of 3 axoloti's connected together without midi or a computer. The patches aren't very good, it was mainly to test the concept (that seems to work very well).
So my next box will be like the yellow one again, most pots are doubled by stereo jack inputs (auto switch). So they can be patched together, or with small sensor modules (a light sensor on a stereo jack, kind of thing).
In this video, all the audio is chained one into the other. The sound is only limited (compressed), no other external effects.