CS4270_MUTE_DAC_A
reg6 |= CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B;
reg6 &= ~(CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B);
cs4270->manual_mute = (left ? CS4270_MUTE_DAC_A : 0) |