Want Only Specific Colours glow while using Music Visualiser?

Hi Guys,

So I have just started using the LIFX A19 Bulb (The first one that I have had) and loving it so far. I wanted to know While using the Music Visualizer feature in the LIFX APP it has two options use random colours and use existing colours, can someone please explain we what is the difference between these two ?

And lets say In the Music Visualizer App I only want it to use some of my Favorite Colours like Pink, Purple, Blue, Silver etc…is there a way to do that so the Music Visualizer Feature will only flicker to the colours that I want, instead of using its own brain to change colour all sorts of colours ?

Thanks in Advance !