Vortex Sound Research

There's a fairly obscure (yet well-loved by those who know it) synth album from 1982 called The Divine Gypsy, put out by the Self Realization Fellowship. The Fender Rhodes is listed as being used on the album, but there's no information on the other synthesizer that was apparently used. I'm curious if someone here might be able to figure it out. Here's a link to the main track on the album: https://www.youtube.com/watch?v=GC72NtPDRVk