A man named Rasmus Brohammer in Denmark makes these. He posts at the Jazz Guitar forum under the name jazzmusWhen I bought mine, it was 215 USD for the small pedal.
The larger one costs more and has an additional control. They sound great.
There is a comparison video in the link below from someone who bought one and also has a MB.
There is no distortion circuit; it's simply the normal preamp. There is a lot of boost and I believe
you can overdrive the power amp, but don't take my word for it. I've only ever used it for a clean jazz tone.
You can contact Rasmus through the forum. The post is here. He comments at post #6.