Hi,
First of all I would like to say "thanks". You write the best ftp/sft/... client, I've ever seen.
Are you looking for beta-testers, right?
Anyway please see the issue below:
Android 4.2.2
Ftp-express 2.4.1
Please go to "Settings" -> "Notification ringtone" -> It's possible to choose another one, but after pushing 'Ok' it's not changed.
Let me know whether additional information is needed (e.g. log with enabled debug or so)