Does anyone have any thoughts or experience regarding differences in cornet and trumpet embouchures? For example, the cornet embouchure being more puckered - greater lip mass in mouthpiece (more space) and less requirements for extreme registers...some say that there is great similarities between horn and cornet embouchures as the play funnel mouthpieces....

In general a trumpet player will keep less lip in the mouthpiece (less space) and will be flatter (keeping the upper lip close to the teeth and gums) and firmer than a cornet player.

I am student studying at conservatoire level, recently come off 4 weeks heavy duty cornet playing at a decent level. I have found that my embouchure has gone so far foward into the mouthpiece that I am bottoming out on my main trumpet mouthpiece. It is proving difficult to get the lips out of the mouthpiece again and play with some type of mmm setting.

Any thoughts?

For the past several months, as I have practiced (2-4 hours per day), I have occasionally switched to my old, recently restored cornet for numbers for which a somewhat darker, more mellow tone is appropriate. For trumpet I`m using a Blessing 7C (virtually identical in all respects to a Bach 7C mpc). For the cornet I use a Holton 7C cornet mpc. The only noticeable difference I have found between the two is that it takes a little more force behind the air flow for the cornet, because it has two more bends in the tubing than a Bb trumpet, and a slightly smaller diameter leadpipe. My first guess would be that if you`re "bottoming out" on your trumpet mpc after playing cornet, its cup must be considerably shallower and/or larger diameter than the cornet mpc you`ve been using.