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I just saw the motor last night, and yes, they aren't servos, having no internal position feedback loop (a pot geared to the o/p shaft).
What appears to have happened is the circuit inside has a microcontroller A la Victor 883, driving the servo-style motor, giving you a range of speeds. It also has another input method, giving full speed either way, or stop.
As I say, I just saw it last night.
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