I've heard that song a few times before... I think the first time listening carefully to it years ago, I was under the impression that it was a real analog synth and not an electric bass through effects.

I did a search online and found this discussion: http://www.talkbass.com/forum/f36/jamiroquai-deeper-underground-sound-550021/

The Stomp "Octave Fuzz" would be a good effect to crunch up and thicken your bass tone with, but that won't allow for you to add in a "synth" tone to the mix, since they're both in the same category of effects.

If you're really determined to copy/replicate that sound, you'll probably have to split your bass signal before the Bass PODxt Live, and route one thru the Octave Fuzz and the other signal through a different effect unit (possibly one of the ones mentioned in that thread above).

Then, you can mix the two signals (one distorted bass fuzz and the other a bass synth tone), I'm sure what you'll end up with is a thick and mean sound.

It still won't be the same as playing a real analog Moog bass synth patch, though. The way the oscillators "drift" and portamento/glide have a big part to do with the authenticity of the sound you hear in their recording.