using a template for galleries within an album

Hi, im using
[album id=1 template=extend] to display an album which is fine, but how do i use a template on the galleries within that album.
I’ve tried copying my template to gallery-extend.php and putting in view folder,I’ve even create an album template and gallery template in a nggallery folder within my theme but nothing works, the galleries always use the default template.

thanks in advance