I have created a bass-tilt plug-in by modifying the existing Nyquist plug-in for a 15-band equalizer.
My first question is, am I violating the GNU public license by modifying existing code to make it work differently?
My second question is, what is the best way to make it available to others?
The plug-in works by suppressing high frequencies in a linear fashion across the audio band. It does not boost anything (risk of clipping) but applies a linear attenuation slope from 20 Hz to 20,000 Hz according to the amount of “warmth” selected by the user (it has just one control) with the greatest amount of suppression occurring at high frequencies. It works well and I think it sounds good, particularly on male vox. The idea was to add “proximity effect” to a mic and make non-ribbon mics sound like a ribbon mic worked up close.
I sure as heck don’t want to have a lawyer review the GNU public license and if the license proves too onerous, it is frankly not worth my while to have it leave my hard drive.