While I wait for the MKII preorder...- Will any 3 button expansion that worked on the MKI work on the MKII?- Any recommendations for particular brands that match well w/ the morningstar?
Yes, the MKII uses the same aux switches as MKI.
We've got some recommendations here:
https://manuals.morningstar.io/mc6-mkii-manual/external-aux-switch