dev-libs/expat
media-libs/libsndfile
media-libs/libsoundtouch

media-libs/portaudio[alsa?
]
media-libs/soxr
>=media-sound/lame-3.100-r3
x11-libs/wxGTK[X]

alsa?
      ( media-libs/alsa-lib )

ffmpeg?
      ( media-video/ffmpeg:= )

flac?
      ( media-libs/flac[cxx] )

id3tag?
      ( media-libs/libid3tag )

jack?
      ( virtual/jack )

lv2?
      ( dev-libs/serd dev-libs/sord >=media-libs/lilv-0.24.6-r2 media-libs/lv2 media-libs/sratom media-libs/suil )

mad?
      ( >=media-libs/libmad-0.15.1b )

ogg?
      ( media-libs/libogg )

portmidi?
      ( media-libs/portmidi )

sbsms?
      ( media-libs/libsbsms )

twolame?
      ( media-sound/twolame )

vamp?
      ( media-libs/vamp-plugin-sdk )

vorbis?
      ( media-libs/libvorbis )