hello all, i am super new to the software, i have just bought it. i have a gig tomorrow and i have watched several tutorials, however i need help in understanding what the composition size should be in pixels. the LED set up is : 1 screen = 20 x 10 ft. 4 screens = 4 x 10 ft. how should i set the pixels size? i have unfortunately not received any stage image from the vendors. thank u in advance.