The MXR doesn't have a clean blend, it's confusing with it's labeling. It's like some one designed the box art and some one disconnected designed the circuit. It's got an EQ which can't fully by turned off and is controlled by the clean knob. As a result it's not particularly transparent and always imparts a certain sound. It's grit is OK but nothing amazing and turning the gain down doesn't take the signal to clean, there is always a level of grit. Get a Blueberry or Wampler Euphoria....they are far more intuitive, interactive and sound better too. They are in the same price point too. The Wampler is a 4 knob OD that actually works how you would expect a 4 knob OD to work. Where as the MXR has a clean knob which isn't a clean blend but a pointless EQ which doesn't sound great, isn't that useful and can't be fully dialled out.
The best and only Use I use my MXR Bass OD for is to sit between my MXR octaver and Filter. It seems most happy to do that, but for other OD duties...there are so many better pedals out there.
MXR pedals are generally a cut above the norm, except their dirt pedals.They mostly seem slightly under par compared to other brands. I prefer an OCD over this box any day....even at the OCD's lighter settings.