Requirements:

perl modules per "perl -MCPAN -e 'install <modulename>'":
  Image::Magick
  Qt
  Net::Amazon
  LWP::UserAgent  2
  Log::Log4perl   0.3
  URI
  XML::Simple     2.08
  Compress::Zlib
  HTML::Parser
  HTML::Tagset


other perl modules per emerge:
  dev-perl/CDDB_get
  dev-perl/MP3-Tag            MP3::Tag

other programs per emerge:
  app-cdr/cdrtools
  media-sound/cdparanoia
  media-sound/normalize

  media-sound/lame
  media-sound/vorbis-tools

own tools:
  wavutil