Most I have seen and the one I have are simple on/off switches for the gas and oxygen to the outer flame. They usually have one set of hoses going into them and two sets coming out. One set for the inner and one for the outer flame connections.
You set the outer flame at the desired settings then push the foot pedel once to cut the oxygen and gas off. You now have your inner fire to do the majority of your work. When you need to the outer flame to melt a gather or some other large task, push the peddle once again and the line is open and the gas and oxygen flow. The outer flame is ignited by the inner flame and bursts into it's preset level. Click the pedel down again to cut it back off.
I have seen a couple of continious variation pedels that work sort of like a gas pedel in a car, but I don't think they are real common.
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Paul Ewing
Torch Ho... GTT Mirage, Carlisle CC, GTT Cheetahs, GTT Lynxes, and others on tanked O2.
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