Modulate the EG decay and release ad mod the filter cut ad res. You can make a good wobble effect if you put some attack on the filter. I used a DS-1 Distortion Pedal with it. I turned down the volume on the volca so the pedal was acting more as an amplifier giving it some saturation.
The quick Attack and decay of the EG resemble a kick drum among the looping bass. Mess with the slide edit mode on the first four steps for variations in the "kick". I added a simple reverb and filter delay to the audio sample.