I don't think - although I can't know for sure - that the sound you heard was colored by CAT electronics to the extent of sounding 'chocolate-y' , unless someone was playing around with tubes.
I owned CAT electronics for many years, and colorations in the system you heard is not an inherent trait of the CAT 'house sound.' Their sound is closer to exactly 'neutral' not "yin" or "yang," although between the two, it would tilt towards Yang (infinitesimally bleached out).
I wonder what else in the system might have produced that. The front end, or the cabling, perhaps?