An analog modulation delay with an unstable tape machine simulator. From slight random vibrato, to "the tape is now piling up on the floor yet is still in contact with the tape head" effects are possible. Available at www.JetCityMusic.com.
http://www.jetcitymusic.com/index.php?page=shop.product_details&flypage=vmj_naru.tpl&product_id=447&category_id=34&manufacturer_id=41&option=com_virtuemart&Itemid=89