Fix build parameter for absolute effects

Hi all, 

I recently tried using the build parameter with an absolute effect but it didn’t work. The intention was to get lights in a softbox to turn on in groups of a couple random lights at a time and then stay on. I turned on cascade entry and stop and hold exit and made it a single cycle duration but that still didn’t work. The effect only worked when I made it as a step based effect. 

While I know I can achieve the same effect with discreet delay timing or a step based effect, having the option to use an absolute effect would be slightly faster and easier. That way I wouldn’t have to input the channel selection into the effect. 

Or at the very least build shouldn’t even be an option in absolute effects if it doesn’t work, so that other less experienced programmers don’t waste their time trying to make it work. 

Thanks

Greg