When I heard Dummy Casual, it drove me insane because I just knew I had heard that "melody" before. It took a few weeks of random listening both to NTS and the back catalogue but I finally figured it out:
Dummy Casual has the same "melody" as tac Lacora! Forgive me if this is obvious to everyone else, but:
Listen to Dummy Casual, 0:00 - 0:50 or so.
Listen to tac Lacora from 0:49 - 1:58 or so.
I have to say, I prefer Dummy Casual to tac Lacora, even though they are brothers (and even though L-event is way high on my list of EPs)...Dummy Casual has this sinister shuffling, feels like you're in a strange land feeling going on.
There's a few spots in the NTS sessions where I've discovered wormholes not just to other material from the el seq era on but also going further back. If I think of any more wormholes I will update.
I just love when artists have recurring melodies or themes across their catalogues, it makes the whole listening experience that much more intense and rewarding. There's not a ton of artists who do it. I suppose Neil Young comes to mind, as does Mount Eerie, in the rock sphere. Electronic-wise, AFX has certain pads and sounds he's very fond of but not necessarily melodies.
Of course, in AE's case, the fact that portions of certain patches are probably re-used modularly also can explain why these pieces of songs appear in other songs as well. With AE, it's not always (or often) melody, but can be any portion of a patch that can be brought in, so the sonic wormhole possibilities are endless.
God bless these boys, each and every one.