Audio Overlay

<?xml version="1.0"?>
<query>
    <userid>[UserID]</userid> <!-- required-->
    <userkey>[UserKey]</userkey> <!-- required-->
    <action>[Action]</action> <!-- required-->
    <source>[SourceFile]</source> <!-- required-->
    <format>
        <audio_overlay>
            <!-- Common overlay params -->
            <overlay_source>[AudioOverlay1Source]</overlay_source> <!-- required-->
        </audio_overlay>
        <!-- ... -->
        <audio_overlay>
            <!-- Overlay params -->
        </audio_overlay>
    </format>
</query>

{
    "query": {
        "userid": "[UserID]", // required
        "userkey": "[UserKey]", // required
        "action": "[Action]", // required
        "source": "[SourceFile]", // required
        "format": {
            "audio_overlay": [
                {
                    // Common overlay params
                    "overlay_source": "[AudioOverlay1Source]"
                },
                {
                    // Overlay params
                }
            ]
        }
    }
}