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The volume slider was linear, which is not ideal for an audio volume control. Perceived volume would not change much within 30-100% range and would change in leaps within 0-30% range where the resolution is not sufficient for fine grained control. The simplest solution is to bring the value into 0.0-1.0 range and square it to obtain an exponential curve. This is a decent approximation of the logarithmic taper used in audio potentiometers.