How Alan Parsons Used a VCS3 to Paint ‘When You’re In’ Under Crushing Film Deadlines

For Obscured by Clouds, Pink Floyd had less than two weeks to write, record, and mix the entire soundtrack for Barbet Schroeder’s film La Vallée. That pressure shaped every decision — especially on the instrumental “When You’re In”, where engineer Alan Parsons coaxed the final mood of the track from a borrowed VCS3 synthesizer.

The VCS3, a modular synth with a distinctive patch-pin matrix, wasn’t Floyd’s go-to at that point. But Parsons had been experimenting with it on earlier sessions. On “When You’re In”, he fed a simple keyboard chord into the VCS3, then manually swept its filter and envelope controls while the tape rolled — creating the track’s eerie, breathing texture that never quite settles into a steady pitch or rhythm. The result is part generator hum, part whale call, entirely glued to the song’s guitar-and-organ pulse.

The film’s deadline meant no second-guessing. The band recorded the basic tracks live at Strawberry Studios in France in just a few takes, then layered Parsons’ VCS3 work directly onto the two-track master because there wasn’t time for a proper mixdown. That immediacy turned a limitation into a feature: the synth sounds ghostly and unquantized, matching the film’s drift through the New Guinea highlands. Parsons later called it “the most spontaneous record we ever made.”