The song was recorded in 1976. The synth appears at around 8:31. It seems like it's a monophonic synth. What also can be heard in the song is:
- The synth's glide function sounds like a "legato", because some notes slide between one another and others just pop right in, so the Minimoog is out of the equation
- There's a chorus effect going on (bucket brigade unit?)
- The synth has a low pass filter, controlled by an envelope/and or a knob or some other modulation controller
- The synth has a pitch bender function (8:51 timestamp)
Does anyone have a clue what this device could be?
UPDATE:
It is possible Serget Locat used a Roland SH-5. Here's a still from a live performance video by this band.

What do you think?
