I have a simple problem with my tenor horn playing - I always seem to be very flat when not playing fortissimo or fortississimo. The tuning slide has to be right out to really perfect the loud bits. Having spoken to some other horn players it seems that this is a very common problem, but the usual suggestions (don't overblow all the time, try taking up bass trombone, etc.) seem to ruin the balance of the band. I'm at my wits' end - I even considered cleaning out the instrument. I wonder if anyone has any useful suggestions?