Editor and fellow ACI Paul Petschek assisted me with this example, as well as reminded me that this is an editing capability that was inspired by another editing application called Lightworks. This relatively new addition to the trimming programming in Avid Media Composer is useful in some specific situations. You may not use it every week but when you need it, you'll have it in your bag of tricks. Its most frequent use would come when editing a montage of video that sits on top of a bed of music and/or voiceover, as is often found in music videos, television commercials, and film trailers.
This recipe will take you through the steps to use the Two Heads/Two Tails Asymmetric Trimming method, and then for the sake of comparison, an alternate method will be presented in the There's more... section of this recipe.