since you have only 18 nodes, to make the custom model work try imagining two things
First a Horizontal dropping down. When would each spike light up, put those numbers in correct place.
Next finish moving the 18 numbers by imagining a vertical bars effect going from left to right.
After doing these two alignments you will have bars working.
You always have on, colorwash, twinkle, strobe,shimmer, fire,spirals
With only 18 nodes you are limited , but those should look good.