- When playing in the low register using valves (F attachment or Gb attachment), it is essential to understand the changes in resistance caused by the valves and to maintain an "upper hold" — firmly anchoring the upper lip against the top of the mouthpiece rim.
- Rather than resting the weight of the mouthpiece on the lower lip, keep it completely free and relaxed at all times. This allows the lips to vibrate freely even in the high-resistance low register, achieving both clear articulation and rich resonance.
- In the extreme low register using double valves, lightly stretch the muscles at the corners of the mouth sideways to maintain the vertical aperture of the lips, and direct the air "forward" rather than "downward," sending a broad, warm stream of air — this is the key to stability.
For trombone players — especially bass trombonists — the rich, powerful low register achieved through the F and Gb (Ges) attachments is the instrument's greatest appeal. However, many players face the frustration of "the resistance increasing and the air not flowing" or "the sound becoming fuzzy and unfocused" the moment they press a valve. When a valve is engaged, the tubing length increases dramatically and air resistance changes in complex ways. Adapting to these changes requires an embouchure strategy and approach to air usage that differ from the mid-to-high register. How do professional players set their lips, and how do they turn resistance into an ally? Let us unravel these specific control techniques.
Clarifying the Concept: "Defend" with the Upper Lip, "Sing" with the Lower Lip
In most cases where the sound lacks clarity in the valve-assisted low register, the cause is excessive mouthpiece pressure on the lower lip, which stops it from vibrating. The ideal setup is to firmly anchor the mouthpiece against the upper lip — specifically, against the bone structure just above where the teeth are covered. This stabilizes the foundation of the embouchure and allows the lower lip to be completely relaxed for vibration. "Defend" the position with the upper lip, and "sing" freely with the relaxed lower lip. By clearly defining these roles, the deep low tones unique to the trombone begin to resonate without obstruction.
Building the Physical Sensation: Double Valves and "Forward-Directed" Airflow
In the even lower range that uses double valves (F attachment + Gb attachment), additional techniques are needed to maintain the embouchure. Lightly pull the muscles at the corners of the mouth sideways, applying a moderate "stretch" to prevent the lower lip from extending too far vertically and closing off. The most important factor, however, is the direction of the air. In the upper register, there is a tendency to blow the air downward, but the lower you go, the more you should imagine directing the air "forward," sending it in a broad, relaxed stream. Picture the sensation of filling the entire wide bore of the trombone with warm air. This mental image helps the air pass through the high-resistance valve section and transform into a rich, resonant sound.
Crafting the Ideal Sound: Mastering Bass Trombone Valve Settings
Mastering valve-assisted low notes will give your trombone the kind of commanding presence that can support an entire orchestra. You may initially be thrown off by the strength of the resistance, but simply by focusing on anchoring the upper lip and directing the air, you will find the notes speaking with surprising ease. Trust your ears and patiently search for the point that yields the clearest, richest resonance. The deep, warm low tones you produce will deliver the ultimate sense of comfort to your fellow musicians and your audience alike. Starting today, fully tame the powerful tool that is the valve system, and unleash the true potential of the trombone.
