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ESP/Speaker: Use a natural sounding volume curve - #167
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Map the 0-100 volume setting onto the TAS5805 digital volume using a square-law amplitude curve (40*log10(vol/100) dB) instead of a linear register sweep. This keeps lower settings audible and prevents the top of the range from jumping by ~24 dB. Volume 100 now maps to 0 dB rather than the amplifier's maximum +24 dB, and volume 0 mutes.
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Stacked on #166.
Maps the 0-100 volume variable onto the TAS5805 digital volume with a square-law amplitude curve (40 * log10(vol / 100) dB) instead of a linear register sweep. This keeps lower settings audible and avoids the large jump at the top of the range. Volume 100 now maps to 0 dB rather than the amplifier's maximum +24 dB, and volume 0 mutes.
Fixes #98.