<table rows="1" cols="3">
    <vbox attach-x="0" attach-y="0" pad-x="10" expand-y="1" fill-y="0" spacing="5">
        <label param="master"  />
        <knob param="master" size="5" />
        <value param="master" />
    </vbox>
    <vbox attach-x="1" attach-y="0" pad-x="10" expand-y="1" fill-y="1" spacing="5">
        <label param="reverb" />
        <toggle param="reverb" />
        <label />
        <toggle param="chorus" />
        <label param="chorus" />
    </vbox>
    <frame attach-x="2" attach-y="0" label="Source">
      <table rows="3" cols="2" pad-x="10" fill-y="0">
          <align attach-x="0" attach-y="0"   align-x="1"><label text="Soundfont"  /></align>
          <filechooser attach-x="1" attach-y="0" key="soundfont" title="Select a soundfont" width_chars="30" pad-x="5" pad-y="6" />
          <align attach-x="0" attach-y="1"   align-x="1"><label text="Current preset" /></align>
          <combo attach-x="1" attach-y="1" key="preset_list" current-key="preset_key" setter-key="preset_key_set" pad-x="5" pad-y="6" />
          <align attach-x="0" attach-y="2" align-x="1"><label param="interpolation" /></align>
          <combo attach-x="1" attach-y="2" param="interpolation" pad-x="5" pad-y="6" />
      </table>
    </frame>
</table>

