Found the solution on the Magic Fields Google group. Thanks.
<?php $myEvent = get_group('podcast');?>
<?php $myEvent = getGroupOrder('podcast_immagine');
foreach($myEvent as $event){ ?>
<?php echo get_image('podcast_immagine',$event) ?>
<?php echo get('podcast_titolo',$event) ?>
<?php echo get_audio('podcast_audio',$event); ?>
<?php echo get('podcast_descrizione',$event) ?>
<?php } ?>
