If you have successfully upgraded the skin from Juicebox-Lite to Juicebox-Pro, then there should be no Lite 'jbcore' folder in the skin and jAlbum will have no option but to use the Pro 'jbcore' folder in the resulting gallery so there really ought to be no Lite 'jbcore' folder anywhere, except possibly already on your web server.

If you've ever used Juicebox-Lite and are upgrading a gallery to Juicebox-Pro then please check the following.

(1) Make sure when you upload your gallery to your web server that the Lite 'jbcore' folder is being overwritten with the Pro version. (It is possible that your FTP program might be set to not overwrite any existing files and folders.)

(2) Try clearing your browser's cache before reloading your gallery's web page to ensure that your browser is using the latest Pro files from your web server (instead of perhaps using older, cached Lite files).

If this does not help, then please post back with the URL to your gallery so that I can check it out for myself and hopefully help further.

Your album is certainly using Juicebox-Pro v1.5.1 and the galleries within the album are definitely using the Pro files.
Your second gallery ('Childrens Ward On The Asylum') displays 54 images (if the gallery was using Juicebox-Lite, only 50 images would be displayed) and thumbsPosition="LEFT" (a Pro only configuration option) is active.
The only problem I can see with this particular gallery is that the audioUrlMp3 has been set as: "gallerysoundtrack.mp3" . (with double-quotes, a tab character and a dot at the end).
Change "gallerysoundtrack.mp3" . to just gallerysoundtrack.mp3 and your audio track should play (as long as the file is in the correct location on your web server).

If you still see Juicebox-Lite galleries within your album (signified by the Juicebox logo in the lower right corner of the galleries), then the problem is more than likely to be a caching issue (either server caching or client-side browser caching).
Check with your web host to see if server caching is used on your web hosting account (and, if so, ask if it could be disabled, at least for testing purposes) and make sure that you clear the cache of any browser that might have been used to view your site whilst Juicebox-Lite files were in place.

Hopefully this will help.

You're welcome.
I'm glad that everything seems to have sorted itself out. Thank you for letting me know.
It sounds very much like some server caching was going on.

I have an account with a web host that uses Varnish server caching. It can be very useful but it can also be a hindrance when developing a web site as it means that after I upload a new version of a file to my web server, the new version is not seen (and the old version is still served) for about 20 minutes afterwards. For this reason, I have Varnish disabled.