I've released version 0.4, which fixes problem with non-ASCII characters in the module title and sample names. As DigiBooster Pro 2.x not saved any codepage information, I assume that all the names are in Amiga standard ECMA Latin-1, which is identical to ISO-8859-1. Then I convert these strings from ISO-8859-1 to UTF-8 and pass to XMPlay.
As for clicks in "zuckerfrei.dbm", the problem is located inside libdigibooster3 and will be fixed there, then I will update the plugin.