Hey Tuan --- thanks for the reply, only just saw this now.
I ditched the whole thing, and re-started a new 7.1 site. Seems there was a conflict with the SCloud player... not sure, but looks like using iframe code is part of an upper plan-tier? I found the SCloud integration app doesnt work well, or using the code window, but I had joy with using the standard embed window. then all codes loaded the SCloud player......
Depending on your plan at SCloud, the standard-tier players have a layover screen with an option to 'Play in Browser' or 'Play on Soundcloud'.... if your plan includes removing this layover screen, I think it conflicts with some of the site code which may include images and site spacing.... its only a hunch, but after a week of re-editing, re-coding and tweaking it seems both players now work.
Unfortunately, I've got a request in to help with placement of text & a player on the site (lower down), as the edit page is no longer updating the main page... we'll get there in the end!
https://www.tazcustommusic.com/
Cheers again for your info. John W.