You don't need folder actions. A better solution is to make the RSS dynamically based on the contents of a folder that you copy your files into (mind you, it presumes that PHP is available, as it is on a stock Mac). For example, put this PHP file in your sites directory, and create a sub-directory there names "podcast" to put your audio files in:

<?php
    header("Content-type: application/rss+xml");
    print "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n";
?>
<rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0">
    <channel>
        <description>My personal podcast</description>
        <link>http://www.nolink.com</link>
        <title>My Podcasts</title>
        <pubDate><?=@date(DateTime::RFC1123)?></pubDate>
        <?php
            $podcastFiles = scandir("./podcast");
            uasort($podcastFiles, "by_date");
           
            foreach ($podcastFiles as $podcast) {
                if (substr($podcast, 0, 1) == ".") continue;
                
                $url = "http://" . $_SERVER['HTTP_HOST'] .
                       ":" . $_SERVER['SERVER_PORT'] .
                       dirname($_SERVER['REQUEST_URI']) .
                       "/podcast/$podcast";
            ?>
                <item>
                    <title><?=substr($podcast,0,-4)?></title>
                    <enclosure type="audio/mpeg" length="<?=filesize("./podcast/" . $podcast)?>" url="<?=$url?>"/>
                </item>
            <? }
            
            function by_date($a, $b) {
                filemtime("./podcast/$a") - filemtime("./podcast/$b");
            }
        ?>
    </channel>
</rss>

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