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If you build up a PAIR of the standard Wogglebug #3 boards, you will
still need a PAIR of ring modulators to cross connect them with in
order to replicate the effects possible with the Wogglebug GR-371, aka the
Wiard dual-Wogglebug. This provides the "child tones". And IMHO, a part
of the awesome sonic power of the device. A single #3 won't make the
sounds of "Forbidden Planet", it can't, it's only 1/2 the equation. 
 I refer you to the very documentation, note that the #3 is a "WOG"
a first order unit:

 http://www.wiard.com/support/WoggleBug-031001.pdf