strobe effect random channel as well as time

I want to be able to hold down a manual bump that causes all active fixtures (not haze or fog or those types) to go to white (home color value) and they strobe randomly by channel as well as random speeds and they do not change fixture focus, gobos, etc. Only the color flashes white and all else remains the same. I did crate an absolute effect with the specific channels however color remains the same.