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10.27.2014, 04:01 PM
The 1st 2 are obvious(steering and throttle/brakes). The 3rd is typically used for shifting(if you have 2 speed electric, for example, or shifting to reverse for the nitro truck). The summit also has a diff lock feature(another channel). "Extra" channels can be used for various things, such as a fan for the motor, lights, etc. :-)
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