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 Alto
  • Tenor Tenor
  • CX90 Bb Tenor CX90 Bb Tenor
  • CX90 Eb Alto CX90 Eb Alto