Multiple meta_key sorts with WP_Query?

Hello,

I’m trying to filter and sort my results on multiple meta keys/values. Is this possible?

Here’s my current set of args I tried to send to the function but they don’t appear to be working…

$args = array(
       		'post_type' => 'workshop',
       		'post_status' => 'publish',
       		'ws-type' => $campsite,
       		'meta_query' => array(
       			array(
					'key' =>  $csite.'-date-block',
					'value' => $days[$d],
					'type' => 'char',
					'compare' => '='
				),
				array(
					'key' =>  $csite.'-time-block',
					'value' => $i,
					'type' => 'numeric',
					'compare' => '='
				)
			),
       		'orderby' => array(
       			array(
       				'meta_key' => $csite.'-date-block',
       				'order' => 'ASC'
       			),
       			array(
       				'meta_key' => $csite.'-time-block',
       				'order' => 'ASC'
       			)
       		), //'key',
       		//'sort' => 'ASC',
       		'posts_per_page' => 100
       	);

This was just a shot in the dark, so I’m guessing the arrays I put in the orderby section are invalid. Is there a way to make this work with WP_Query though or do I need to use a different method? Also, the second field I’m sorting on is a time field, so I’m wondering if the system is going to have an issue with that. I may need to change the type of data being held in that field.

I’m currently on 3.1 but trying to upgrade to 3.3.1 if I can get the host to upgrade the php version on the server.

Thanks,
Wil