CREATE TABLE table_55283 ("Film title" TEXT, "Director" TEXT, "Writer" TEXT, "Voiced character ( s ) " TEXT, "Producer/Executive Producer" TEXT, "Sound" TEXT)

Who was the sound producer that worked under Executive Producer JL?
SELECT "Sound" FROM table_55283 WHERE "Producer/Executive Producer" = 'jl'
SELECT "Sound" FROM "table_55283" WHERE "Producer/Executive Producer" = 'jl'