More masonry blogs

Hi There, I have 3 masonry blogs one wordpress default and two cpt blogs. Two works perfect but i cat get the third working. I use the code below. Can you help me out.

add_filter('generate_blog_masonry','generate_blog_enable_post_type_masonry');
function generate_blog_enable_post_type_masonry()
{
	// Check page template by file name
	if ( is_page_template('sponsoren-template.php') )
		return 'true';

	// Check if blog
	if ( is_home() )
		return 'true';
	
        // Otherwise, disable it
	return 'false';
}

add_filter('generate_blog_activate_masonry','generate_blog_activate_page_template_masonry');
function generate_blog_activate_page_template_masonry()
{
	// Check page template by file name
	if ( is_page_template('sponsoren-template.php') )
		return 'true';

	// Check if blog
	if ( is_home() )
		return 'true';
	
        // Otherwise, enable it
	return 'false';
}