Saintaw ... about the TRRRRRRRR sound

It's the sound that you hear when you are near stall...
Stall occurs when the speed of the plane can't sustain the AoA (Angle of Attack) you pull. 2 kinds...
Normal stall: you fly with an AoA of zero degrees (plane going level) but fly very slow... you'll hear the TRRRRR sound (stallhorn) cause you are nearing a stall.
Accelerated stall: you fly at 300 mph for example but pull so hard on the stick that you have to high an AoA... even at that high speed of 300 mph you will hear the stallhorn cause your AoA is to great for the plane to sustain normal flight.
Now on to your questions.
Do I have to make sure I absolutely NEVER hear it?
It depends... if you are BnZing you don't want to hear it cause when you hear it you are pulling alot of G's and you know G's kill E, right?
Another example... you are in a one on one flat (horizontal) turnfight. You and your con are opposite of eachother in the turn (he's not directly on your 6 and you not on his). You can't break out of the turn cause then you'll present your tail to him and get killed so you keep turning and try to get on his 6. Now... in such a situation it's in fact good to hear the stallhorn... since you'll turn more when pulling harder on the stick (if both of you are already below cornerspeed that is). So in this situation you would be turning while you keep hearing the TRRRRR sound. This is called riding the envelope of the plane (knowing that if you pull the stick even a tiny bit more you'll stall).
Question 2:
Can I hear it, ONLY when I realy have to break hard?
No... if you hear it while you break hard its an accelerated stall, if you hear it for example when you are slow trying to land it's a normal stall.
Hope that helps

Bee
Nemo impune lacessit