Thanks for sharing!
For anyone not satisfied with this I advise using m4pdf module - needs a bit of tweaking and possibly code changes but will get you what you want
Anyone has this mod or something similar for back office? Need it badly.
https://addons.prestashop.com/en/order-management/19078-sound-of-new-purchase-playing-music-after-purchase.html?_ga=2.142232501.602338646.1576828258-1591898708.1576828258