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If enabling the personal setting "Hide text...", you'll only see the icons representing actions. Read more
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Can I edit stuff (track names, performers, albums) ?
Yes, although there seems to be no option to do so...
You must do the following:
1. Login as a user with administrator rights.
2. Switch on the display of ID's. It's a personal setting - it can be turned on/off under "Settings" -> "Display ID numbers".
3. Locate the track you want to edit (or get rid of), f.ex. in the "Track" view and/or by searching.
4. Click on the id-number.
...this will take you to an "edit-mode" of the track, where you can change name, year, performer and/or transfer the track to/from an existing album.
Clicking on the ID-number will only edit+modify the stuff in the database, not what's in the tags on the filesystem.
If you want to edit the actual tags found in the music tracks on the filesystem, it's also possible.
Provided permissions to read/write are OK on the actual file in question, a link ("Edit tags") will be shown next to a given track. If clicked, the user will be able to edit/inspect/change the tags in the music track itself.
After saving any files that have had their tags modified, it's necessary to run a new scan+import with "Re-process tracks found in database AND on the filesystem" and "Delete "dead" records" turned on.
More about scan+import here: http://www.ampjuke.org/index.php?id=faq55
Important: Before editing, It's important you know at least a little about the various ID3-tags (as well as understanding the difference between ID3v1 and ID3v2) can be found here: http://en.wikipedia.org/wiki/ID3