[Plugin: Widget Logic] How to use TTF_Titles styles other than default?

This plugin looks like just what I need to customize my widgets with TTF_Titles. However, I can’t seem to get it to use any of my defined TTF titles styles other than the one designated as default. No matter what I put into my functions.php code, the widget titles show up in the default style, not the style I want (“widgettitle”).

Here is the code I’m using in my theme’s functions.php:

function ttftext_widget_title($content='')
{   preg_match("/<h2[^>]*>([^<]+)/",$content, $matches);
    $heading=$matches[1];
    $insert_img=the_ttftext( $heading, 'widgettitle', false );
    $content=preg_replace("/(<h2[^>]*>)[^<]+/","$1$insert_img",$content,1);
    return $content;
}

TIA for any suggestions!