Other electro instrumentation was generally electronic, favoring analog synthesis, programmed bass lines, sequenced or arpeggiated synthetic riffs, and atonal sound effects all created with synthesizers. Heavy use of effects such as reverbs, delays, chorus or phasers along with eerie synthetic ensemble strings or pad sounds emphasized the science fiction or futuristic themes of classic (1980s) electro, represented in the lyrics and/or music. Electro hip hop group Warp 9's 1983 single, Light Years Away, produced and written by Lotti Golden and Richard Scher, exemplifies the Sci-Fi, afrofuturist aspect of electro, reflected in both the lyrics and instrumentation. The imagery of its lyrical refrain "space is the place for the human race" pays homage to Sun Ra's 1974 film, while its synth lines and sound effects are informed by sci-fi, computer games, and cartoons,"born of a science-fiction revival.".