I have had an old Russian Big Muff for many years and loved it. I have always wished for a blend knob to mix in clean signal. Finally, the Deluxe Bass Big Muff is out. I asked for one for Christmas. I can't wait. However, I am also interested in an MXR M89 to use with my current band. Even though I used my old Big Muff all of the time in my last band, it may be a bit too much for my current band. It is still a ton of fun to play fuzz bass alone. If you go with the Big Muff, I would highly suggest the Deluxe Bass Big Muff.