Simon, how are you connecting the computer to the mount? Whatever cable you are using for this (not counting the ST-4 cable) is what is used for pulse guiding. I think from what you say you are doing it in PC-DIRECT mode on Synscan, which is fine for using pulse guiding. Basically, just ditch the extra ST-4 cable, and turn on ASCOM pulse guiding. This has another advantage - if using EQMOD, you can also use VS-PEC with no clash with AG.
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