DESCRIPTION: Here is a look at the Stomvi Titan 4 valve Bb trumpet prototype. This instrument lowers the pitch a tri-tone when you depress the 4th valve. It is made to expand capability for soloists or those that want for an increased lower register. http://stomvi-usa.com/welcome-to-stomvi-usa/ http://www.facebook.com/pages/Stomvi-USA/106129483617