Hi cubace,
We do not need the MCU protocol we need the component (the one you choose in the “Studio Setup Settings”) and there is no Sysex for communication between MCU protocol and the MCU,XT,C4. Except the only time, when you turn on the devices. This sysex needs to be in the component, because otherwise the MCU protocol can not see or create the connection.
There is no real protocol spec for the C4, but there is for MCU and XT. It is the one in the Logic 7.2 manual i previously posted.
If you turn on a C4 and start the Commander software, you will see what a successfull sysex connection means, because then the C4 is ready to be programmed with the MCU protocol or the Commander software. If you then start Cubase and use the MCU component (the one you choose in the “Studio Setup Settings”), then the encoders will start working, except no display and you trick/fool the MCU protocol, because it thinks that there is a MCU (in reality a C4).
This process, can not be fooled by other hardware (Behringer, Novation etc.), because you cannot “steal” the sysex of a hardware. This is a proof that the MCU protocol handles MCU+XT+C4. This process only worked, because we used the Commander software for sysex handshaking and then started Cubase.
Since Cubase does not have a C4 component (with the sysex), the MCU protocol can not see it.