>=x11-libs/gtk+-2

sndfile?
      ( >=media-libs/libsndfile-1.0.10 )

sdl?
      ( >=media-libs/libsdl-1.2.3 )

alsa?
      ( media-libs/alsa-lib )

jack?
      ( >=media-sound/jack-audio-connection-kit-0.98.0 )

esd?
      ( >=media-sound/esound-0.2.0 )

libsamplerate?
      ( media-libs/libsamplerate )

ladspa?
      ( media-libs/ladspa-sdk )

sox?
      ( media-sound/sox )

arts?
      ( >=kde-base/arts-3.4.1 )