Hello, am now moving on to songs in my beginners book that use the octave key. More than half the time I get nothing but screech sounds. Somtimes I also get a burbling sound which i am guessing is my sax playing the note in both octaves back and forth really fast(really annoying). My first question is ,is this normal for a beginner? Is lip strength involved here to? Should I expect high notes be easier to play after developing stronger lip muscles? I have tried different positions with my lips to do this and sometimes I have the notes playically perfectly but then I lose whatever I was doing even though my lips feel like they haven't moved.