wext.left = f64_msb_mul(f64_from_lsb(wext.left), rs->left_ext_gain);
wext.right = f64_msb_mul(f64_from_lsb(wext.right), rs->right_ext_gain);
wext.left = f64_msb_mul(f64_from_lsb(wext.left), rs->left_ext_gain);
wext.right = f64_msb_mul(f64_from_lsb(wext.right), rs->right_ext_gain);