Thoughts on adding a preview/example of what an effect looks like on the effect buttons in the app? It would contain what’s shown on this wiki page:
I would be happy to build a pull request to add this if it’s something that would get integrated.
GUI have a preview for effects in real time.
The Peek button at the top of the wled interface kind of does what you seek to peek at 
Yes but that requires actually changing the lights as you are testing various combinations. Not a big deal I guess. Was thinking if they showed on each button it would be a lot faster to pick something similar to what you were looking for.