audio_sample
$meta_query = array( 'relation' => 'AND', array( 'key' => 'wpcf-resource-type', 'value' => 'audio_sample', 'compare' => '=', ), );
$meta_query = array( 'relation' => 'AND', array( 'key' => 'wpcf-resource-type', 'value' => 'audio_sample', 'compare' => '=', ), );