After doing my own tests on this theory, I came to this conclusion- Matching the pitch of both the bell vibrations and the pitch of the air passing through the lead pipe and tuning slide did make a difference in how the instrument sounded and responded. The only problem with the thought that the instrument is more in tune with itself is that any change in the position of the tuning slide will have similar affects on your instrument. I found nothing note worthy in this experiment and would compare the basic sound and response of a Bb trumpet to…