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Ah - but that is about the advantages of the EQMod on an EQ6 so I am not sure this really applies to Gemini driven mounts - for example PEC on a Gemini can be combined with ST4 guide inputs - in fact this is SOP as far as I know.
So Pulse gives speed and duration but has to go via the firmware whereas ST4 signal is on/off only (ie duration) at whatever guide rate is set (typically 0.5x) and acts directly on the motor controller.
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