im guessing a silly melody are the simple, casio type 4 or 5 notes that are repeated over and over the entire piece of hard mettalic beats and loud beeps and whisses that ae use. the best example of which i can think of is on the 2nd track (cant think of name) on their 1995 peel sessions e.p. after lp5, my favourte ae release.
the melodies completely dissapeared for a while after that but again they are back , more subtley, on the new album which by the way, i love even more now.
basscadet.... a genius of a song!