Borg "bandpass" mode: Ok BP was easier to fit than "Helmholz resonator". Filters by definition, remove stuff. So a bandpass filter will always have an audible power loss. A resonator on the other hand stores energy from previous cycles to build up the amplitude of a wave of a specific frequency. It is the only acoustic system that can have gain as they noticed in the 1800's with clay pots.
The BP mode of the Borg filter simulates a Helmholz resonator. It has a uniform gain of 1 except at the resonance point where the gain can climb to clipping. This does not lose audio power. Another advantage to this approach is that several resonators can be put in series to form very aggressive formant and vocal filters.
With a normal series of bandpass filters, the inputs would have to be multipled and the outputs mixed in parallel to make a formant since their gain is one only at the bandpass frequency (they filter each other out in series).
With the resonator approach, all the extra patching is not needed since you can simply chain them in series.
Hope you find them amusing. The Boogie was designed to be standalone, but the Borgs thrive in a hive.
Borg I & II[modifier]
Removing the jumpers yields higher resonance/screaming a la the original 300 series borg.