ETC 24/48 Is it possible to create a completely random chase

I want to do a couple things. Where running and older ETC 24/48/

 

1. I want to create a completely chase, but the lights that come on for each step are completely random (for example if I create 20 step chase, and want to use channels 1-50, I would like it randomly, pick with channels come on for each step)

 

2. I want to use almost every light I have in a chase, so we are talking about 400 channels, minus a few lights. I don't want to create 20, steps and then try to figure out distribute 400 channels, amongst  20 steps,  this leads back to my first question, is there a way to it randomly distribute these 400 channels?

 

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