Skew on both fade and release


Sorry if the subject title is way off - I'll try my best to explain what my issue is..

I've got some fixtures in a long line, and I want the light to fade on and parse across the line, like a small strip of light parsing across some fixtures.

I've tried combine different effects with the skew setting, and that makes the light fade on like I want, but it fills out all the selected fixtures, and the all just fades out.

How can I achieve this?

I hope this description contains just a little bit of meaning - I'm struggling to describe it proberly in English, so please ask if this is nonsense. 

Best Regards