It's disputed as to whether these horns use an SX90 body or a Buffet S3 Prestige body. My (Pete) *opinion* is that these are SX90s, with the exception of the low B/Bb key, which is an obvious Buffet design.
There are a few videos on YouTube.
Alto
Tenor
CX90 Bb Tenor
CX90 Eb Alto
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