Let me describe a problem which I communicated to rern via a personal message already.
Most of my audio files are classical music in 24/96 FLAC format. All of the audio files are tagged according to my overall ID3 tagging scheme. A symphony is modeled in the "album title" tag as "<composer>: <work>" and optionally followed by a popular name of the work enclosed in double-quotes, if such a popular name is available for that musical work.
An example:
Dmitri Shostakovich: Sinfonie No 12 d-Moll op. 112 "Das Jahr 1917"
For every movement of the work (separate FLACs) the "track title" tag is modeled according to the movement heading and looks like
IV. L'istesso tempo. Morgenröte der Menschheit
The corresponding file name is "04. IV. L'istesso tempo. Morgenröte der Menschheit.flac".
The double-quotes in "album title" are generating trouble. Switching from one movement to the next, the track title (= movement heading) does not change. I.e. the whole symphony will be played, but with the track title of the first movement. Neither the coverart nor the sampling info are available.
Additionally, if you use coverart thumbnails and browsing by coverart the thumbnail is generated.
File name:
'Dmitri Shostakovich: Sinfonie No 12 d-Moll op. 112 \"Das Jahr 1917\"^^Dmitri Kitajenko + Gürzenich-Orchester Köln.jpg'
But in the thumbnail window an empty one is displayed.
In RuneAudio 0.4 beta the double-quote problem doesn't exist.