Append query string to URLs in Genesis Custom Loop

[simbasounds]

In my functions.php I have a function to add a query string to my post links.
It successfully adds ?source=home to post links generated by Genesis Featured Posts widget at the top of the page.

function append_query_string( $url, $post, $leavename ) {
	$url = add_query_arg( 'source', 'home', $url );
	return $url;
}
add_filter( 'post_link', 'append_query_string', 10, 3 );

But it isn't adding the string to title links in my Genesis Custom Loop lower down on the same page:

remove_action( 'genesis_loop', 'genesis_do_loop' );
add_action( 'genesis_loop', 'home_archive_loop' );
function home_archive_loop() {
	global $paged;
	$query_args = wp_parse_args(
		genesis_get_custom_field( 'query_args' ),
		array('cat' => '200', 'paged' => $paged, 'posts_per_page' => 2)
	);
	genesis_custom_loop( $query_args );
}

Any ideas on how to modify the function or the custom loop so post title links have the query string appended?

http://eggfilms.wpengine.com/

[simbasounds]

Solved. Seems it is working after all. My co-developer is using a method of inserting custom title links I hadn't spotted.

[Author]

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