Inspiration for Phasor dates back as far as 2019, during a trip to University of Illinois Urbana-Champaign to learn about the complex synthesizer machine "Sal-Mar" developed by American composer Salvatore Martirano.

Other means of inspiration for the album include Lange's previous relocation to Asheville, North Carolina in order to be closer to his family, as well as the theme of food and the phrase "you are what you eat".

[4] Phasor features nine tracks that Lange promoted through the release of the lead single "LFO" (abbreviation for "Lupe Finds Oliveros"), an "immersive experience that entrances and bewilders", performances at the Pitchfork Music Festival in London and Paris in 2023,[5] as well as a world tour through Europe and North America in spring 2024.

[7] Uncut felt that "while Phasor standouts such as 'Flores' evoke Os Mutantes in a narcoleptic fugue[, ...] on 'Colores Del Mar' and 'Out There', he strikes an equally deft balance between aqueous abstraction and buoyant, big-hearted avant-pop".

[9] Tom Johnson of The Skinny called it an "endearingly tight collection" as well as a "rich and absorbing record that truly transports; placing the listener in a languid, half-lit morning where you're never quite asleep and never fully awake".