[Jzarecta]

Looking for best most-have addons to manage music libraries. I am looking for equalization and sound effects (3D, large hall, wet, dry, Jazz, Rock, Hiphop) to get on my Kodi.

If anyone has any most check out add-ons for these topics.

[da-anda]

not yet available, but is beeing worked on atm as part of the GSOC

[Jzarecta]

Ah I see, that's too bad, I also see that there is not that many visualization options available, not sure is because a change on the way from XBMC worked compared to Kodi.

Which media engine does Kodi uses?
Update: Wikipedia seems to have this on the media library https://en.wikipedia.org/wiki/Kodi_(soft...ayer_cores
Where can I find more technical details about it (language used, and compatibility with other media libraries like gstreamer or Phonon.

[da-anda]

Kodi is using ffmpeg on all platforms. Check this subforum for AudioDSP related stuff: http://forum.kodi.tv/forumdisplay.php?fid=235

[RockerC]

I am looking for equalization and sound effects (3D, large hall, wet, dry, Jazz, Rock, Hiphop) to get on my Kodi.

For this specific question you want to checkout the project for AudioDSP http://forum.kodi.tv/forumdisplay.php?fid=235 but note that this has nothing to do with visualization in Kodi.

Which media engine does Kodi uses?
Update: Wikipedia seems to have this on the media library https://en.wikipedia.org/wiki/Kodi_(soft...ayer_cores
Where can I find more technical details about it (language used, and compatibility with other media libraries like gstreamer or Phonon.

Not much in the wiki http://kodi.wiki/view/PAPlayer or http://kodi.wiki/view/DVDPlayer but at least looks to have some basic info.

Better check source code https://github.com/xbmc/xbmc/tree/master...s/paplayer and here https://github.com/xbmc/xbmc/tree/master.../dvdplayer

As you can see there, Kodi uses in-house developed audio and video player cores, PAPlayer for music, and DVDPlayer and platform derivatives for video, these are both written in C++

I also see that there is not that many visualization options available, not sure is because a change on the way from XBMC worked compared to Kodi.

They to use in-house developed C APIs. OpenGL/DirextX visualizations work the same in Kodi as in XBMC, though since Kodi is a cross-platform application that complicates it a little.

Suggest to first checkout this discussion here http://forum.kodi.tv/showthread.php?tid=204991 then follow all the threads here http://forum.kodi.tv/forumdisplay.php?fid=38

Also see notation here http://forum.kodi.tv/showthread.php?tid=228893 about the fact that the API for Audio DSP addons have nothing to do with visualization addons or their API.

Looking for best most-have addons to manage music libraries.

That sounds as a usage question and not a developers question, and regardless I don't think that "media library management" have anything to do with your other questions.

For media library management checkout the wiki about http://kodi.wiki/view/Adding_music_to_the_library and all the other related articles and tutorials linked from there.