CREATE TABLE table_name_96 (division VARCHAR(255), regular_season VARCHAR(255), playoffs VARCHAR(255), league VARCHAR(255))
What division did the Nashville Metros play in during the year that they did not qualify for the Playoffs, where in the USL PDL League, and had the Regular Season 7th, Southeast?
    
SQL: SELECT division FROM table_name_96 WHERE playoffs = "did not qualify" AND league = "usl pdl" AND regular_season = "7th, southeast"