I would like visitors, to whom I send a link to a specific page, to be able to download my posted mp3 files. Can I make my audio files downloadable from a Sparkle page?
of course, you can have a look here: https://sparkleapp.com/docs/how-to-add-a-downloadable-file.html
To prevent the automatic playback of the MP3 with a “normal” click, you can also (additionally) provide it as a ZIP file.
A right click with the mouse on a MP3 should show the following “Save file as …”