@paul-flute Could you say which YouTube video are you referring to? This one ... https://www.youtube.com/watch?v=YdiqO-dJoRY ... is the top hit for "Eustache Sylphyo Mainstage" ... but I'm not sure that's the one.
In my limited experience so far, I have had to do some basic customization to most of the virtual instruments that I want to respond to CC messages such as those generated by the Sylphyo Elevation, Roll, and Compass (Pitch, Roll, and Yaw). This customization has been straightforward in the sound-rendering tools that I use: Kontakt, Reaktor, Cantabile, Respiro, and other plugins all have some straightforward way to map a given CC to a given control within their interface.
In particular, I have found Cantabile to be excellent with respect to managing the overall structure of a song (and a full set list), with all their attending instruments, effects, routes, interfaces, and recording requirements. One thing it does not really handle is live looping - I am currently using a physical looper for that.
However, some of the "MIDI Learn" functions that are straightforward for keyboard players are not so useful with the Sylphyo, since it is producing multiple CCs whenever you move the instrument. A few tools will display a choice of all the received CC messages when you initiate a "MIDI Learn", but it can be a challenge. I usually just type in the controller number and range.
Another challenge may be how to map the range of CC value to the desired behavior. Some CC values produced by the Sylphyo - elevation, for example - were not what I had imagined at first, and I had to sit down with the Sylphyo Bench application or run a MIDI monitor to explore what was actually being sent by the Sylphyo.
I have found that having a good command of the MIDI monitor tools in my system to be critical to diagnosing subtle playing issues. One or another virtual instrument might respond unexpectedly to the precise sequence of MIDI commands output by the Sylphyo, and the MIDI monitor tools come to the rescue (I have found this particularly true with physical modelling engines built by various folks in Reaktor 6).