JimJim the Candyman
How do you play pedal notes? Is it just really loose embouchere? Or slow air? How do they work?
Yes, you really need to relax the jaw. You should almost feel your lips vibrate.
When you start out, you will probably be out of tune. For me, I was flat, so I needed to lip it up. No, never use slow air. In fact, for every partial which you move down on a certain dynamic, you should use almost twice the air. when moving on the first partial (pedal tones), use more air, less tounge.
On another note, for those who have the f-trigger, you can play the second half of the second partial. ever notice the gap between the low f and pedal Bb? low f in sixth can be played in first position with the trigger. E can be played with the trigger and a slightly long 2nd. Eb in a long 3rd and trigger, D in a Very long 4th (almost fifth) and trigger, Db in sixth and trigger, and C in seventh and trigger (though you will probably need to lip it down). Practice it, it's quite fun!