Well either way. I've tried a lot of pedals with the blend knob and all they did was over compress the low end on my bass making it less punchy. When I engaged any of these pedals during band practice my bass would basically become non existent in the mix. The low end, no matter how high I had it set, would disappear. The Tech 21 pedal does not change my bass tone at all. It has my same tone as clean with distortion layered on top, like it should be. It's like having one Speaker playing just your clean bass tone like you like and another speaker with distortion. So that the two exist as one. Not that one blends in with the other. 1/2 distortion and 1/2 clean, or any variation of that, is not what I am after. I wanted 100% clean along with 100% distortion. Not one taking away from the other in the signal to make room for itself. The Tech 21 Dug Pinnick or bi-amping is the way to go for true bass distortion.