Is it this part? YouTube - Goedicke Concert Etude for Trumpet and PianoPut your thinking cap an! What are auditions for? To find out the limits of a player? Not in my book. The show off is the player that I do NOT want.
I listen to figure out if the player has any common sense, musical taste, humility, confidence, rhythm and enough chops for the job.
If you have the Concert Etude under control at quarter=185, go for it. You'll smoke most of the professionals that I know. It better be metronome perfect if you do it though. A couple of bars of "WEAK" (any of us that have played this know which ones that I am talking about......) shows that you do not have a good grip on common sense, rhythm, musical taste and that humility is missing. It also means that your confidence is misplaced. Chops alone does not get you a spot in the orchestra.