the AIS, what and why it's very extraordinary horns, what is the difference between the AS and AIS
AS for Adolphe Sax models was the current models that you could be find for plenty money, yes it's expensive horns around 3000€ for soprano and alto, 4000€ for ténor and 4500/5500 for baritone.
AIS is Adolphe Sax experimental/prototype, it's globally horn that adolphe sax (himself) played and keep for him, and when it tried to experiment plenty thing. This soprano is shorter in compareason of another soprano, it missed 2 keys (palm keys) it was rework by adolphe sax for unknown reason and that is cool, it's prototype of soprano without palm keys for unknown reason. That is cool horn, and i will pay only 2500€.