Use alsamixer's volume mapping for lxpanel volumealsa plugin.
"The mapping is designed so that the position in the interval is proportional to the volume as a human ear would perceive it (i.e., the position is the cubic root of the linear sample multiplication factor). For controls with a small range (24 dB or less), the mapping is linear in the dB values so that each step has the same size visually. Only for controls without dB information, a linear mapping of the hardware volume register values is used ... "
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