I wonder if there are any VSTs which remove automatically the main harmonic content from an audio source.
For example, if I have a simple sine wave this hypothetical device would return absolutely nothing, silence.
If the sine wave has been previously distorted a bit, then this device would return at least some of the noise produced by the distortion, omitting the frequency of the original sine wave.
What I wish is a tool that does not only automatically remove one single frequency, but a set of frequencies that might be harmonically related. For example, passing a pure sawtooth trough the device would also return silence.
I think that a device like this has to exist already. Any pointers?