hn vcf is a state variable filter having 12 db low pass, 12 db high pass, 6 db band pass plus 18 db low pass marked as "lp!", because it has extra drive. all three parameters: "freq", "resonance" and "drive"
have dual knobs with outer knobs controlling bipolar cv amount. these affected cvs are then shown by the relative green/blue leds.
the possibility to have cv over "resonance" and "drives" makes it a very capable 6 hp filter.
hn vcf can be used to transform mono sound to pseudo stereo. to do this the user should send "lp" output to one channels and "lp!" to another. with some "drive" added to the sound it starts to be spread over
the stereo field.
