Try it this way. Go to settings >session and startup >application autostart and add a new entry. I had to play around until it worked. There was an initializing problem. On my Zorin virtual machine sct doesn´t work, so I can´t test it for you. Maybe it also works on your machine with just
sct 3500
in the command field.
I don't know how to enter the sign ' on my laptop keyboard, this one I used, not ". I'm not sure if it makes a difference.