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Help with Sabertooth 2x25

Hey everyone. I am building a couple of projects using electric wheel chair motors. I am using the Dimension Engineering Sabertooth 2x25 motor controller. The proble I have is I am sending pulses of 1000, 1500, & 2000 us to the sabertooth and am getting random results (both forward, one forward the other reverse, both fast, both slow, one fast & one slow, etc) with no apparent consistency.