‘Warm-Up Sheet 1’ uses the first five notes that I teach beginner players. I also use the ‘low notes’ very early on as I believe the control of these notes facilitates control over higher note production.
 

Move your mouse pointer over the music to hear what the note should sound like
(only a 'jingle' at the moment, better quality recordings are being prepared).
The HOLBARTO technique to Trombone playing by Neil Wittmann
The HOLBARTO technique to Trombone playing by Neil Wittmann Your first five notes The HOLBARTO technique to Trombone playing by Neil Wittmann
The HOLBARTO technique to Trombone playing by Neil Wittmann
the low notes
The HOLBARTO technique to Trombone playing by Neil Wittmann
The Lo hi lo hi ex er cise
The HOLBARTO technique to Trombone playing by Neil Wittmann