I am unsure what the SV stands for in this mod destination. Can anyone enlighten me? Thanks.
SV = State Variable - This control only affects the SV 2-Pole Oberheim filter, and swings it from Low Pass -> Notch -> High Pass mode.
There's a sort of hidden control in the mod matrix too.. I've been meaning to record a video demo about it. There's an additional destination for "SV Norm-BP", which is routed to the Band Pass mode of the SV filter. From the panel, you just get a switch for 100% ON|OFF for the bandpass mode, but by using this mod destination, you get a continuously adjustable variation of the Bandpass... you can get some really interesting sounds by mapping LFO to this parameter, or other sources.