Ampache makes every effort to read tags as defined in the standards. Currently Ampache uses Getid3() for all tag reading. There are no known issues with getid3() and correctly tagged files. There are some known issues with malformed tags and getid3() that can cause segmentation faults or memory leaks in PHP.
Ampache uses the tag_order configuration variable to determine which tags ampache will read, and in which order. The default value is
tag_order = "id3v2,id3v1,vorbiscomment,quicktime,ape,asf,file"
This means that ampache will look for id3 version 2.x tags first, and only if there are no id3 2.x tags will it read the 1.x tags. If you want to change the order simply update your config file and re-run the verify.
The file method requires additional configuration on the catalog in question. The file method uses the file and folder patterns defined during the creation of the catalog. If you would like to modify it after the fact simply update your catalog