Taking away the frequencies above 4K will lead to a rather muffled sound because it will reduce all the overtones that are responsible for a brilliant sound. I suggest a noisegater and a harmonic exciter instead - and turn of the screen when recording.
[FONT=Times New Roman]Holiness is in right action and courage on behalf of those who cannot defend themselves. What you decide to do every day makes you a good person... or not.[/FONT][br][br]