The Aerophone Pro AE-30 preset Trumpet scenes have "Growl" or "Fall" assigned to the [S2] button or the thumb pad. If the sound cuts off unexpectedly, an unintended key may be pressed during playing.
For preset scene "06: Brasswinds - 01 Trumpet 1," the fall effect is applied when blowing into the instrument while pressing the thumb pad. The fall effect stops the sound after the last note is played, which may appear as though no sound is being produced. If this occurs with certain fingering, check that no unintended keys are being pressed.