Ordering results by custom field

Finally solved this issue myself. I’m using the plug-in on a real estate site and needed to have the results ordered by property price asc rather than post date. In case this is of any use to anybody the code that I modified in faceted-search.php ended up as follows:

function facetedsearch_simple_query($effective_array, $descendant_array, $and_or)
{
	global $wpdb;
	$query = 'SELECT SQL_CALC_FOUND_ROWS DISTINCT * ';
	$queryfrom = 'FROM '.$wpdb->posts;
	$querywhere = " INNER JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id) INNER JOIN wp_postmeta ON (wp_posts.ID = wp_postmeta.post_id) WHERE 1=1  AND post_type = 'post' AND post_status = 'publish' AND (";
	//see if the current foreach loop has run at least once
	$ran_once = 0;
	//loop through all selected terms
	foreach ($effective_array as $id)
	{
		//validate the value before inserting it into the query
		if (is_numeric($id))
		{
			if($ran_once == 1)
			{
				$querywhere .= ' '.$and_or.' ';
			}
			$in_string = implode(',',$descendant_array[$id]).',';
			$in_string .= $id;
			$in_string = trim($in_string,',');
			//get the object id of each post associated with the the current term id and its descendants
			$querywhere .= '(ID in (SELECT tr'.$id.'.object_id FROM '.$wpdb->term_relationships.' tr'.$id.', '.$wpdb->term_taxonomy.' tt'.$id.' WHERE tt'.$id.'.term_id in('.$in_string.') AND tr'.$id.'.term_taxonomy_id = tt'.$id.'.term_taxonomy_id)';
			$querywhere .= ')';

			$ran_once = 1;
		}
	}
	if ( $ran_once == 1)
	{
		$querywhere .= ') AND (wp_postmeta.meta_key = "true_price" ) GROUP BY wp_posts.ID ORDER BY wp_postmeta.meta_value+0 ASC';

		(isset($_REQUEST['paged']) || isset($_GET['facetedsearch']))
		{
			$offset = 10*intval($_REQUEST['paged']);
			$offset = $offset > 0 ? $offset - 10 : 0;
			$querywhere .= ' LIMIT '.$offset.',10';
		}
		$query = $query.$queryfrom.$querywhere;
		return ($query);
	}
	else
	{
		return '';
	}
}

should have said in case it’s not already obvious, my meta_key, the price which I wanted parsed as a number, is “true_price”

sorry important copy and paste error – lost an important “if” – above should read
`if (isset($_REQUEST[‘paged’]) || isset($_GET[‘facetedsearch’]))