The Sequential Circuits Prophet-5 polyphonic synthesizer was the go-to keyboard for 'icy synth strings' in early electro

The Prophet-5 appears across multiple classic electro tracks as the source of characteristic cold, glassy string patches. On ‘Planet Rock’ John Robie played it live, deliberately imitating Kraftwerk. On ‘Electric Kingdom’ Gordon Bahary used it for ‘fat’ harmony on the lead melody (‘Very fat sound and great filters’). Man Parrish used a Prophet-5 alongside a Pro One on ‘Hip Hop Be Bop,’ and Dolby was known to use one on Whodini material. The Prophet-5’s five-voice polyphony and lush filters made it ideal for sustained, hovering string-like sounds — but it was expensive, so cheaper string machines (Roland RS-09) substituted on lower-budget tracks like Cybotron’s ‘Clear.‘

Examples

‘Planet Rock’ Prophet-5: glassy synth strings deliberately aping Kraftwerk’s ‘Trans Europe Express.’ ‘Electric Kingdom’: Prophet-5 for lead-melody harmony. The Roland RS-09 string machine stood in when the Prophet-5 was out of budget.

Assessment

Why was the Prophet-5 aspirational gear for electro producers? What cheaper alternatives were used when it wasn’t accessible, and how did that shape the sound palette of lower-budget tracks?