solved The Meaning of "updated" in lists?

<?php
/**
 * @copyright noone
 */

// make sure we are not being called directly
defined('APP_DIR') or exit();

/**
 * meta
 */
function xxAudioOrder_meta(){
    $_tmp = array(
        'name'        => 'AudioOrder',
        'url'         => 'audioorder',
        'version'     => '1.0.0',
        'developer'   => 'noone, &copy;' . strftime('%Y'),
        'description' => 'Update audio files _updated key when comments are added',
        'license'     => 'mpl',
        'category'    => 'custom'
    );
    return $_tmp;
}

/**
 * init
 */
function xxAudioOrder_init(){
    jrCore_register_event_listener('jrCore', 'db_increment_key', 'xxAudioOrder_db_increment_key_listener');
    return true;
}

/**
 * Increment the _update key when a comment is added
 */
function xxAudioOrder_db_increment_key_listener($_data, $_user, $_conf, $_args, $event)
{
    if (isset($_data['key']) && $_data['key'] == 'audio_comment_count' && isset($_data['update']) && $_data['update'] == false) {
        $_rep = array('audio_incremented' => time());
        jrCore_db_update_item('jrAudio', $_data['id'][0], $_rep);
    }
    return $_data;
}

/**
 * Increment the _update key when a comment is added
 */
function xxAudioOrder_db_increment_key_listener($_data, $_user, $_conf, $_args, $event)
{
    if (isset($_data['key']) && $_data['key'] == 'audio_comment_count') {
        $_data['update'] = true;
    }
    return $_data;
}