How to play the Bass in Jarre's Equinoxe 7

How I think the Bass in Jean Michel Jarre's "Equinoxe 7" is made
His home build MatriSequencer 250 triggers the ARP 2600 with the only two patterns in the song, in a combination you can see in the video
The pitch is made with Monophonic Legato Portamento.
This is just a test to show and the bass sound is just a fast made sound in Reason 4.0
Thomas H. - http://www.thhe.dk