There is a bottom purple layer displayed in some of the song-specific tutorial videos that is not part of the patch. Up until Sunday Keys version 1.3, that purple layer was a part of the functionality of the Tonic Pad Player. It is not necessary for your patch to fully function and is no longer a part of up-to-date Sunday Keys concert files.
You are not seeing this layer because you are either: using a newer version of Sunday Keys, or not running the Song Specific Patch within Sunday Keys.