Warburton P.E.T.E. Personal Embouchure Training ExerciserThe P. E. T. E. PRO is an advanced level isometric strengthening tool to be used by experienced altissimo players. It is important that users have well developed embouchure strength and or previous experience with the P. E. T. E. for Brass before using this model. Players who are required to regularly play in the extreme upper register, or those who have reached a plateau in their efforts with the original P. E. T. E. will find that the P. E. T. E.