Try this example based on filter self oscillation (you can play with most of the parameters to suit your taste). Start with init patch ("C126 - Init -" on a Virus C):
Make the analogue filter self oscillate and decay:
Osc vol: -64
Filter 1 mode: Analog 4P
Filter balance: -64
Cutoff: 60
Resonance: 127
Filter env. amount: about 55
Filter decay: 100
Make LFO2 "wobble" the filter and make LFO1 modulate the "wobble" rate:
LFO1 rate: 22
LFO1 contour: -50
LFO1 envmode: on
LFO1 shape: saw
LFO1 -> assign, dest: LFO2rate, amount: +25
LFO2 rate: 90
LFO2 shape: triangle (try different shapes, some of the waves works well too)
LFO2 -> filter 1: +33
This is to make the sound die out with a more "square" decay:
Mod assign 1, source: ampenv, dest: ampdecay, amount: +50
Amp decay: 35
Add reverb if you like...
Here´s a sample:
http://hjem.get2net.dk/revolution/wobble.mp3