Audio player shortcode not showing up when using variable

Replace following line

 $result .= 'echo do_shortcode('.  get_term_meta($term_id, 'audioreco_64856', true)  .')';

with

$result .=  do_shortcode(''.  get_term_meta($term_id, 'audioreco_64856', true)  .'');

Echo the result of function

<p><?php echo first_audio(); ?></p>