Posted by Chuck(G) on April 19, 2001 at 12:26:59:
In Reply to: Adjustable cup mouthpiece posted by Ola Ness on April 19, 2001 at 07:06:46:
I've got one and find that it's interesting, but of marginal use.
Typically, you'll find a single position on it that works well; everything else ranges between bad and really bad. In a pinch, you can use it to correct some intonation problems on a horn to a certain degree, but don't expect miracles. After using mine, I can really see where a trumpeter might use one (cup depth doesn't have such a profound effect on intonation as on a tuba), but a tuba ACM seems to be mostly a curiosity piece.
They're not cheap; if you're still interested in using one, I'll be happy to sell you mine.