Just a quick tip here for dual mapping one controller to two sources, since multiple mappings on one control seems to be not possible in VCV.
I wanted to save presets on @stoermelder 's transit, but still be able to control the mapped controls via midi. Here we go: Knobs (as an example) is mapped to 23Volts Multimap and the Multimap-Button is mapped to Transit.
I think if Transit had a Midi-Cat-Expander, that could be useful (expecially since 23Volts github seems to be gone…). Oh, and the option to receive and switch presets via program change. And 128 presets of corse… I think I need to head over to Ben’s GitHub 
Edit: … first issue on Ben’s GitHub is already about dual mapping… 