I'm assuming the Violet Muffer is based on a Big Muff, they're known for having a weak midrange. If you otherwise like it, Minotaur Sonic Terrors (out of Greece) makes the Swamp Lord, which has a mids control. I bought one recently and it's everything in a band mix I always wished a Muff was, as far as boutique pedals go it's pretty reasonably priced too.
