gentoo-overlay/media-sound/qtractor/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <herd>proaudio</herd>
  <use>
    <flag name="dssi">Enable support for DSSI Soft Synth Interface</flag>
    <flag name="rubberband">Enable support for in-place audio clip pitch-shifting through the rubberband library</flag>
  </use>
</pkgmetadata>