On the Seminal 1976 Oxygéne Album, Jean-Michel Jarre used two 75/76 Electro Harmonix Small Stone Mk1 Phasers with the string section of an Eminent 310 Organ to get his amazing stereo pad sound. In this video I two 1975/1976 Small Stone Mk1 Phasers with a Clavia Nord Electro 3 that has the Eminent 310 string machine samples. I'm also playing Farfisa Organ, Piano, Wurlitzer and Mellotron Strings through the two phaser. I think this setup comes close to many classic 70s keyboard tones.
How to connect and sync two EH4800 (version 4 or 5) in stereo
https://www.youtube.com/watch?v=q6fURkOPl5Q