I was listening to the group Terravita's song and heard a awesome sounding synthesizer with what sounds like it has heavy effects. It sort of sounds like a flanger, but with an almost wetness or moist sound. Maybe used some type of formant oscillator for the basis of the sound. At least that's what it sounds like. When I attempted adding a flanger to synthesizer I like, it didn't sound like this even when automated via an envelope on the effect or done manually. Didn't have that moist feeling.
I don't need to be explained how to create the wobble or basics unless you think they did something out the ordinary to create this sound.
Here is the song with the first instance of the sound: