Posted by S. Lamb on May 28, 1999 at 00:53:37:
In Reply to: Re: Re: 3 piston + 1 rotor posted by Jon on May 27, 1999 at 14:42:54:
I saw an extra valve added to Ron Bishop's 3/4 Mirafone CC. The horn originally had 4 rotors, and he added a 5th to help with lower register. Granted, its 4 rotors + 1 (additional) rotor, but I don't see why a thumb rotor added to a 3 valve piston would cause a problem. Good luck.