harold wrote:The reason I pull slides is not so much to deal with the sharpness of using valve combinations
Interesting. I saw Chris Olka's masterclass at the University of Washington last month and he manipulates his first valve slide so much, I thought he was a trombonist.
Obviously he is a great player, but I'm not certain to the efficacy and accuracy of these slide movements relative to each pitch.
Since he had a full studio, there are now several students that have likewise adopted that habit. It would seem to me that the actual change that you can get from a fractional movement of a tuning slide while playing could be accomplished within the embouchure.
One generally does not pull slides to play in tune. Buzzing the accurate pitch does that. A tuba sounds better (and notes are easier to hit accurately) when the correct pitch you are buzzing is at the center of the tuba's resonance. Slide pulling centers the resonances.
The argument my teacher gives me is that I should not be working my chops lipping pitches up or down to be correct. Rather, I should use my chops to produce a good tone, articulate well, etc.
I have the good fortune to own a tuba with generally good intonation (a Meinl Weston 32). My personal compromise is to do no slide adjustments when playing fast. I do adjust the first valve slide for some notes while playing them loud or long.
Incidentally, slide adjustments can open up the possibility of using different fingerings. For example, in one piece I had to do a long sustained trill between E (normally fingered 3) and D (normally fingered 4) -- awful. With a pull of the first valve slide, I could trill between E (3) and D (13) -- easy. There have been other times when a bit of valve retuning has helped to avoid moving a lot of valves for a quick passage. My fingers can move fast enough, but getting all those many feet of tubing to respond acoustically is really tough.
I should add that I'm just an amateur. A really good player may not see any need to do some of the things I just described. As for me, I'll take any advantages I can get!
Cheers,
Allen