gentoo-overlay/media-sound/rezound/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="16bittmp">Use 16bit temporary files (default 32bit float), useful for slower computers</flag>
    <flag name="soundtouch">compile with support for soundtouch</flag>
  </use>
</pkgmetadata>