Adjust minimum dropout of each frequency bin#32
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Increases the dynamic range of each frequency band from 30 dB to 50 dB. For a typical audio output resolution of 16 bits a single LSB is
10*log10(1/2^16) = -48.2 dBFS. Expanding the dynamic range to 50 dB ensures that there is minimal (but nonzero) difference between the minimum non-zero slider value and zero. Previously the difference between the lowest non-zero setting for each frequency band and zero was significant, making it difficult to form a gentle frequency dropoff.Note that this change will rescale any existing saved spectra.