Hey so not exactly a movie but I encountered some pretty good TV audio recently if you like synths.

On Netflix, Guillermo Del Toro has an anthology series with different directors called "The Cabinet of Curiosities". I've only seen a couple of episodes so far, but anyway, there's this rather atmospheric 1970s billionaire themed episode called "The Viewing" that has a great retro-synth style sound track with lots of low synth bass and drones all episode long.

Apparently composed by John Lopatin (Oneohtrix Point Never, whom I haven't really checked out and don't really care for that much). I would have almost thought it could have been Carpenter.