I play Eb tuba, and sometimes I come across bending down in my notes - either as an effect at the end of a note, or sometimes as a slide between two notes. I find this difficult to achieve with a good result, even using some kind of half-valve technique. Do you have some good descriptions on how to do this succesfully?
"Effect" at the end of a note:
Example is taken from the Frasier theme (from the TV series). See the last note.
Slide between two notes:
Example is taken from a short intro to the Michael Jackson song "Don't stop till you get enough".