1. You can download examplary file from here
2. Copy downloaded file to:

c:\Program Files\ArcaBit\ArcaVir

or any other location you installed ArcaVir to.

3. You can use any other file it it meets aftermentioned rules.

a) file has to be named “alert.wav”
b) it has to be “WAV” extension file.  Any other audio files will not be run.
c) if you would like to use an audio file with different extension, convert it to “WAV”