i just added to the tutorial… scroll or search for filters.
[How To] Plexamp 3.0 - Testing / Plex Labs - Plex Forum
@aubrey.wodonga GREAT playlist, i’m gonna steal that from ya 
here’s mine… anything i’ve added THIS YEAR, that i’ve rated higher than 2.5 stars, and haven’t listened to in over a month.
edit: added filter for 12month period vs static date for rolling smartplaylist.
