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I was sure there was a topic about this somewhere already but couldn't find it.
For a good frantic set you will need:
Pixie sets both sides!
Quantum set
symposium quantum set
Eggbeaters may help.
I think Ken's tip - which is basically that frantic is a pixie set pixie set (two alternating pixie sets) is the best tip - that's exactly what it is for me too. So if you want to learn the set you need to be able to pixie on both sides - even if you only want to hit it on one side. That said - I think it's fairly easy to learn it on both sides because you're doing similar things both times.
I also think of it as a bit of a symposium quantum pixie set. This basically means that I jump in the air as I'm setting the bag before i've dexed it - so it's like you do a lowish set and then two pixie sets while in the air.
It really feels very powerful to me so you want to really rip with the second dexing leg - that leg is the key. Push your knee inside of the bag and then out lifting it as high as you can - very fast and strong movement.
That's about it then I can think of. Good luck.