hi i have a few .mp3 songs in my library which have the song name enclosed in speech commas e.g ArtistName-"SongName".mp3 . they will not open with alsaplayer unless i remove the commas from the song name and then they play perfectly, so perhaps you need to add special characters to your song name filter.
please remove this bug i made a mistake in that i had an .wav file named as a .mp3 so infact the song name with commas/quotes works fine.