+1 re jnealand.
Again - being new to xlights , I used the random generator on a 'test seq for the same song', sat back and noted the effects that looked good (that never in my life would I have thought off) .
Repeated this a few times.
Then opened the real sequence and added them as required
I think that the use of 'R' mentioned above would do for me. I believe I have watched all Seans videos of 4.x on vimeo, but I did not see the use of alphabets to get effects done described could be done.(I saw one where a Ramp up , down , On).