There in fact is not really a "Default".
In Reaper, the communication with Control Surface devices is handled by the "Control Surface Mode" setting (Preference -> Control/OSC/Web -> Add).
Here you can select as well built-in modes as modes provided by Reaper extensions (such as "CSI", which is discussed in this subforum).
Many of these Modes (can) use (variants of) the Midi-alike "MC" ("Mackie") protocol.
Hence "MCI" is a kind of "Standard", that is supported by many DAWs. Hence it might sense to adhere to that protocol with the device you are about to create.
-Michael
Last edited by mschnell; 11-07-2019 at 08:54 AM.
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