A few hours ago, I successfully updated my S2 Mk3 to version with MIDI mode. (Windows 10 Pro, Version 1709) Meanwhile, I tried using S2 Mk3 as generic remote in Cubase 10. Although many functions are very well described in your attached Definition Document, but some of them still remain unclear, at least for me. For example, I can not make to work meters on S2 Mk3, until I have been found an unexpected solution; MIDI Channel 6, note G-2 for Mixer Channel A VU Meter and MIDI channel 7, note G-2 for Mixer Channel B VU Meter. Cheers!