Hey Pete,
To control the scope via stellarium it is done using the stellarium scope program.
Download it and the EQmod and EQ ascom programs and connect it to the PC by the white serial DB9 to RJ11 cable to the handcontroller and put the hand controller into PC direct mode using the utility menu option.
While the scope is in pc direct mode, start stellarium scope and connect to the HEQ5/EQ6 option in EQascom and make sure you are using the correct serial port on the PC.
USB to serial adaptors can be tricky as some of them do funny things or not work at all, so I have a laptop with a built in serial port (9 pin) and it works flawlessly.
Similarly, avoid upgrading the Synscan using a USB to serial as this can also not work.
Having said all this, "driving" the scope using stellarium isnt going to quieten the motors if something like PEC is still on like Barry said.
Check the tracking mode in setup menu is set to sidereal and see if you can clear the PEC training data. If all is well, the mount is almost silent when its simply tracking in RA on a star or object.
Cheers
Chris
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