Yamaha YEP-321 Owners Manual - Page 12

Before You Play Always store the instrument in its case when taking a break, during transport, and after playing. Always remove and disassemble the leadpipe assembly before placing the sousaphone or marching tuba series instruments in their case. About the mouthpiece The mouthpiece that is supplied with your instrument is a standard mouthpiece. The mouthpiece is designed to fit into the mouthpiece receiver without being loose. Do not treat the mouthpiece roughly, drop, or damage the mouthpiece, etc. * The bell on the euphonium or tuba may be positioned opposite of that shown in the above illustration depending upon valve position and case design. About the Compensating System The pitch of long tubular instruments such as the euphonium becomes slightly higher than the true pitch when multiple valves (the 4th valve in combination with the 1st3rd valves, etc.) are depressed at the same time. The compensating system provides pitch correction in such cases. It also allows the playing of fast passages in the low range without having to change fingerings for the 1st through 3rd valves when the 4th valve is depressed. The YEP-642/YEP-842/YBB-632/YEB632 are equipped with a compensating system. The compensating system on the YBH-831 corrects the pitch when the third valve is used in combination with the first and/or second valves. 28