ref: 9100891c84b449d0de9615aba688364dd630b068
parent: 3eda05d9718f56dab29ea5eeb11919f288be14a6
author: Krzysztof Nikiel <knik@users.sourceforge.net>
date: Tue Aug 15 11:21:00 EDT 2017
give more quality to lower frequencies, less quality to highs