关于长号的口形问题和号咀在嘴上的放置位置的谈论很多。然而绝大多数的长号吹奏法既不强调形成吹奏力量的面部肌肉的正确位置,也不对在不同程度的铜管演奏者中普遍存在的嘴唇过分紧张或过分松弛现象给予警告。 嘴唇的过分紧张会导致声音的变异:发音迟钝或根本发不出音,或者所发的音比意 Talk about the trombone’s mouth shape and number Tsui mouth placement. However, the vast majority of trombone exercises neither emphasize the correct position of the facial muscles that form the playing force nor warn of the excessive tension or excessive relaxation of the lips, which is prevalent among brass players of different extents. Excessive strain of the lips can lead to variations in the sound: dull or not pronounced, or pronounced