library.creativecow.net/mcauliffe_kevin/Avid-Media-Composer_69 In this lesson, Kevin P McAuliffe shows you how to take a green screen shot with a lot of compression, and create a great looking key right from within your MC/Symphony timeline. Most editors choose to use the RGB keyer, but after seeing this tutorial, SpectraMatte will be your new “go to” effect for all your keying needs.