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Originally Posted by squeeforever
My 9920 does that. It gets higher pitched as the speed increases, right?
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Yeah. When I got it I thought it was kinda neat, but just thought it was a feature of brushless. If you do it right, you can play a tune. :) I am using it on an 8XL, but the quark is on a 10xl. I can't see this making a difference though. It's probably due to the switching speed of the pulses.