Trumpet: Trill (12th-13th)

   The "feel" for notes in the upper octave is close.  So pay attention to pitch.  And if need be, master each valve position one at a time (from either direction).  Also it is not a bad idea to sound the starting note one octave lower to establish pitch before commencing the trill.

   Fast trills are not essential.  But evenness in the trill is.  Add or subtract from the trill as endurance dictates and do not over-practice.