I don't think those are sine waves because you can clearly hear wah-wah style filter modulation on them [which won't work with sines].
Off the top of my head, I would try a sawtooth with the cutoff down maybe halfway. Use the filter envelope to open the filter at the beginning of the note. And yes, loads of tasty portamento!
I reckon a seventies sound like that wouldn't be all that complex so you could probably get quite close quite quickly. But I'm kind of guessing about that.
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