pcm1796_write_cached
pcm1796_write_cached(chip, i, 20, reg);
pcm1796_write_cached(chip, i, 18, reg);
pcm1796_write_cached(chip, i, 16, chip->dac_volume[i * 2]
pcm1796_write_cached(chip, i, 17, chip->dac_volume[i * 2 + 1]
pcm1796_write_cached(chip, i, 18, value);