The keymap-based solution above is not supposed to control the lights, just buttons, is that correct? (Reaper can't use the MIDI message information in the keymap to send same kind of values back to the control device?)
If that's the case, is anyone still interested in having full(-ish) support for US428? I'm thinking of trying to do it, but it's probably not worth the effort if I was to be the only user.
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