My two cents:
I’m a doubler, and bass is my primary. Yes, bass takes more air because there’s less impedence. Larger mouthpiece, larger tube, additional tubing, etc. You will breath more often, and you will use more air playing a forte (or a piano) on the same note compared to someone playing tenor. Get used to sucking in more air and…
…using that air efficiently. That is, it’s critical to develop an
efficient embouchure and efficient use of air . Many novice bass trombonists, as well as middle and high school bass trombonists, use either way too much or way too little air. Just as importantly, it takes time to develop an embouchure that produces maximum resonance with minimum effort.
The ideal is to play a clear, present pianissimo that is heard by everyone in the hall even when the rest of the band or orchestra are playing. That takes (a) a constant, steady stream of air of the appropriate size passing by (b) an embouchure that is (c) appropriately tensed around and below the corners and up to the mouthpiece, so that it is (d) enough to keep the lips in place to vibrate and (e) loose enough in the center to vibrate.
But remember that an embouchure is dynamic. It has to change with different pitches, volume, etc. The challenge is to have an embouchure that produces a consistent sound in an efficient manner. (I’ll leave the mechanics of an appropriate and well-functioning embouchure to Doug Elliott, Dave Wilken, and other experts.)
A couple of concepts that I’ve found helpful with lip slurs are:
1. Think of connecting the notes so that you’re playing a full chromatic scale between each note in 1/100th of a second.
2. Think of the next note in a slur as a “snap” from one note to the other, but a “snap” that is so gentle as to not be heard. There’s simply one note and another note in a constant sound.
Practice ideas that have helped me:
1. Play the slur as a glissando (fast and slow) that then “snaps” to the next partial. For example, going from
![Space 3 :space3:](./images/smilies/Space3.gif)
to
![Space 4 :space4:](./images/smilies/Space4.gif)
, play a glissando from
![Space 3 :space3:](./images/smilies/Space3.gif)
down to fourth position and then at the last minute “snap” up to
![Space 4 :space4:](./images/smilies/Space4.gif)
. Then, use the opposite approach. Play the
![Space 3 :space3:](./images/smilies/Space3.gif)
then immediately “snap” up to the next partial and make a quick glissando down to
![Space 4 :space4:](./images/smilies/Space4.gif)
.
2. Play a passage all glissando, in time and in tune. Make the glissandos all very quick but with a smooth slide motion—no herky jerky movements, just a smooth, efficient motion that stops at each note. Use that feeling and the sound of the glissando as a guide to steer you towards the direction of a beautiful slur.
I’ll shut up now…