How to sort a list of CPT-onomies

I have a two custom post types for Events and Speakers. I’m using CPT-onomies to connect the two and list the Speakers appearing at each event. (So far, so good!)

However, now I need to list the Speakers in a “specific” order – ie: not alphabetical. I have tried using ‘orderby’ to specify a sort order, but the orderby parameter seems to be ignored. I can specify ‘order’ as ASC or DESC, but this only rearranges the alphabetical listing.

Here is the code I am using:

<?php
global $cpt_onomy;
$args = array('orderby' => 'meta_value_num', 'meta_key' => 'speakerorder', 'order' => 'ASC');
$speaker_terms = wp_get_object_terms($post->ID, 'launch_speakerbio', $args );
if ( $speaker_terms && !is_wp_error( $speaker_terms ) ) {
  echo '<span class="speakerlist">Speakers: </span>';
   foreach ( $speaker_terms as $speaker_term ) {
      echo '<a class="speakername" href="' . $cpt_onomy->get_term_link( $speaker_term, $speaker_term->slug ) . '">' . $speaker_term->name . ' - '.get_post_meta($speaker_term->term_id, 'speaker_company', TRUE).'</a>, ';
   }
}
?>

And here is a link to the page: http://www.oktane13.com/agenda/

http://wordpress.org/plugins/cpt-onomies/