4 soft volume ramp-up after error (bit 3), 5 soft ramp-down before filter mode change (bit 2), 6 invert signal polarity (bits 1:0) – Cirrus Logic CS4271 User Manual
Page 40: 3 dac volume & mixing control - address 03h, 1 channel b volume = channel a volume (bit 6), 2 soft ramp or zero cross enable (bits 5:4), Cs4271
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