The notification parameter, as you may have seen, is built from four parts: color, level, duration, and effect. As with the “regular” LED bar, color is just hue, so saturation is not available. One specific “color” value (or range?) was supposed to white, but that appaerently didn’t make it into the firmware, even though I think that did make it into some documentation. I didn’t see it mentioned in any of the beta firmware release notes, but maybe in the future? See this post for more: