Highpass filter.
Four flexible paremetric bands (Lowmid, Highmid, High-1, High-2).
All bands has selectable frequencies, total range from 35 kHz ~ 15 K.
Resonant filter per band.
Solo and Boost per band.
Bypass per band and global bypass.
Main volume out.
Stereo and mono versions.
Update 0.8: Added boost funtion. New highband added. Small engine tweaks.