I play in a jazz band and we are playing some Latin pieces. In "One Note Samba" there is written "in stand". What does that mean? How to play that with the trombone?
you literally just point your bell into the stand, not directly touching it, but the sound should be muted by the stand
If your worried about catching your bell on the stand, try a bucket mute for a similar effect. It may be about keeping control of volume, or it could be a stylistic effect.