I have been practicing with the low pressure and low mouthpiece force for a while. Recently though I have found that the only way to get a consistently good tone throughout the range of the horn is to pucker my lips up and apply a small amount of pressure. I can hit the notes above and below the staff, but they just don't sound very good, every time without a little pressure. Is this normal, or a slippery slope? I think it is odd, that I need the pressure in the low range too, almost backing off into the high range, also I don't seem to need any more lung force and if anything it seems I need less.