I'm in high school and while practicing i noticed a few things. 1. when i do long tones sometimes what i do is hold a note as long as i can (usually from C below the staff to G above) and look at a tuner and just try to keep the note in tune. what i noticed is that i can do this from C to C and then when i get above that, especially on D and E, i'm extremely flat. i don't think it's that i'm tired because i dont take a break and once i get to F and G i'm fairly around the mark again. does anyone else experience this? how do i fix it? 2. when i'm doing long tones and i tongue the tuner shows that i go out of tune (usually flat) for the split second i tongue and then i go back in tune. is this normal? and if it's not how do i fix it? 3. how does it affect my practicing and development if i play soft as opposed to loud and vice versa? sometimes i notice that when i play soft for a while my lips start to strain, like i'm lifting weights (although i get that quite often when i practice). should i practice both soft and loud (although i'm expecting the general response to be about mf), or just one way? I know i had more questions but i forgot them....although i know i'll remember them five minutes after i post this. Thanks in advance!