Make each cartwall loadable/importable from an Excel or CSV file
Make each cartwall loadable/importable from an Excel or CSV file, which you simply specify when starting Cartwall.
The file's name ... e.g. SATURDAY NIGHT HITS.xls ... would become the cartwall page name and the file would contain columns and rows for every audio filename, title, artist, intro length, cart color, plus all the other options, etc.
(The source folder for all the audio files could be specified in the Settings page).