Last Ninja - Wilderness Opening Bassline?

This has been destroying large portions of my life for some time…

On the wilderness level of The Last Ninja on the good old C64, it begins with this bassline:
Last Ninja - Wilderness

which has been since remixed by Marcus Geelnard and sounds like this:

I want to reproduce the sound but just can’t seem to get anywhere near it.

I generally use Nexus and Vanguard for instruments and it sounds like it’s flanged but I can’t for the life in me reproduce the sound.

The renoise file is here:
midi file

Can someone save me from the endless torment? :huh: