Many of us use more than one mouthpiece when we play- whether its for switching between Bb, flugels, pics, C trumpets, or just switching between a Legit and a Lead mouthpiece. What I've noticed when I am going to definitely be switching back and forth is that it helps me to warm up on the smallest and/or shallowest mouthpiece I will be using that day. For me, the little adjustment tweek between bigger and smaller seems to be alleviated by warming up this way. Am I completely off base? What do you do?