placing a variable in a MPEG Sreamclip window

I lost my original code and only have the application version so I am reconstructing the script. I need to get a variable into Streamclip and completely forgot how to do it. this code brings up the dialog box to enter a time code. must I copy and paste the variable timeCode into the menu, if so how?

tell application “MPEG Streamclip”
end tell

tell application “System Events”

click menu item "Go to Time." of menu "Edit" of menu bar item "Edit" of menu bar 1 of application process "MPEG Streamclip" of application "System Events"

end tell