Hello everyone. I've had a problem that has been developing for a number of weeks now that I have had to find an answer to as it has been affecting my performance and morale quite a bit. I will backtrack first: I have been playing on a Parduba 6 mouthpiece for about 10 years now with a bored-out 2nd cup (making it a single cup Parduba). It was starting to get old and I decided to replace with a new Parduba 6 around September of 2008. Now when I first started playing on that new 6, my playing was outstanding. My endurance was way way up, higher register, tone, everything changed almost automatically. Even the other musicians mentioned a huge change in my playing. Anyway, as the weeks went by I started to notice something very very strange: It seemed as if my upper lip would be "interrupted" from vibrating inside the new Parduba 6 (un-bored). This happened especially when I would play mid-range notes (1st line E up to about middle C or 4th line D) and in a louder volume. When I would play softly, the notes would come out. As soon as I raised the volume (to how I used to be able to do for years on the bored-out Parduba 6) I would start to hear the note, along with ANOTHER type of overtone/fuzzy note in there as well. It felt as if I was playing 2 notes at once! Extremely annoying. I decided to switch from parduba and so I purchased a 5C Best Brass mouthpiece. The 5C was very close to the Parduba 6 in rim diameter so I felt it was the best choice without having to shock my system with a radical change in mouthpiece. Anyway, I felt that the 2nd cup in the parduba was getting in the way of my upper lip and creating this type of secondary "fuzzy" note that would occur with mid-range notes and only at FF to FFF in volume. With this new 5C my lips are much more sensitive to buzzing (which is great news of course), my tone is better and my endurance is starting to climb (I've been using it only for a month so far). Now what is happening is what happened on my new Parduba 6! If I play a G in the staff over a certain volume that secondary type of note comes out as well! I can feel the center of my lips somewhat "collapsing" into the mouthpiece while the muscles around my aperture and out around the mouthpiece are strong! I never remember having this squishy/soft aperture feeling with my old bored-out Parduba 6. I know I have Maggio type of embouchure where my lips kind of pucker into the mouthpiece slightly. My questions here are: Is my new 5C mouthpiece too shallow of a cup and the reason for me feeling/hearing these strange fuzzy notes come out in the mid-range? Will placing the mouthpiece lower on my mouth help? I've evaluated my mouthpiece placement and I've noticed that I have about 2/3rds of my upper lip inside the cup and very very little of my lower lip in. I've tried putting 1/3 to about 1/4 of my upper lip in the cup (whereas moving the mouthpiece down on my lips and causing my lower lip to fall into the mouthpiece more) and although it feels strange and uncomfortable I don't have that "fuzzy note" problem even when I play FFF in the middle register. The only problem with leaving 1/3 - 1/4 of my upper lip in the cup is that it feels like the mouthpiece is cutting into the tip of where my upper lip buzzes. Is that a normal feeling? Ever since I bought the 5C I've felt that it was bigger than my Parduba 6 and had more of my upper lip in the cup than I did in the Parduba. Will a 7C/D or a 9C/D help or make any difference? I'm sorry about the novel I wrote here but I wanted to be as descriptive as possible with anyone that has ever gone through something like this. This is a very new occurence with me and I wonder if the switch to the unbored Parduba 6 last September or BestBrass 5C in early January caused me to develop bad playing habits. Thanks very much for all of your help!