Available as an assembled Module and as a DIY project.
This Module is currently available.
Oakley SVF Fully Featured 2U
This is a two pole multimode filter capable of high pass, low pass, band pass and notch output modes. All four outputs are available simultaneously. This new version of the very popular Oakley design is based around the classic two pole state variable filter topology as used in a variety of vintage synths including the Oberheim SEM and OB-X. At high resonance the Oakley SVF will oscillate over the whole of the audio band and is temperature compensated.
The design is intended to fit into a 1U wide 'filter-cor e' module or a more fully featured 2U wide panel with seven control pots.
These merchants probably sell this module. Huh?
