Cover Page Slide Show Speed

Hi 

I'm trying to control the speed of the slideshow in my cover page in the same way that I can do it in the galley block.

Is difficult to replicate all the features doing it from scratch in a blank page. I'm working in CARSON template. 

I saw the a recent topic about do in it from scratch but I think doesn´t work in my page.

https://forum.squarespace.com/topic/160829-code-for-cover-page-or-alternative/#comment-361403

Thanks in advance for any idea!!

Cheers!