Hiya, I was wondering if anyone could perhaps give me some insight on a problem I have been running into recently. When I begin my practice session (30-60 mins) I usually have trouble producing a strong solid sound, and my range is pretty poor. This continues for most of my *first session* of playing. I usually end up putting the horn down for a few hours or so and bam when I pick it up again 3-4 hours later after a 3 min warmup or so I am blasting high c's and getting a very dark, centered tone. Any idea on what could be causing this?