We have a number of Belas at RITMO, and these have been used in several of our installations (self-playing guitars) and performances (with the muscle band).
Rotate between patches
It is possible to switch between patches on the Bela using this "hack":
- Name your projects loop_XYZ (where XYZ is the actual project name)
- Choose one of those projects to run on boot
- Whenever you press the button on the cape to stop the program, it will relaunch the next one in the list.
That should work for Pd or for other projects.