Thanks for the link. I missed that video when searching for info. I like the sound of it a lot.I have not personally tried them but I did contact Aaron Drake and asked about them and was told the Bebop Classic did not come in a large chamber model, which I prefer. The people I know that play Drake's mps. really like them. But I've been informed on here by the mouthpiece police that I lack in manufacturing experience therefore my opinion is invalid. Here's a link to Drake's site.
https://www.drakemouthpieces.com/Bebop_Classic_Alto.html