One of my favourites Drives for bass. I own 6 different drive pedals, each one with its own character of course. But the Darkglass Vintage Microtubes is something really special. I am using it since months now, so I review it on a long time based experience ; ) Its circuit provides a great sound. The DRIVE knob defines the amount of drive. Since this affects the overall level, with the LEVEL knob you can compensate it or get a volume boost when adding drive and raise the overall level as it fits to your need. The ERA knob makes the Vintage Microtubes pedal unique. Turned all the way down, you get a darker and more mid-focused tone that may remind you of the 70's, and as you turn it up the tone becomes gradually more modern. The BLEND adds a lot of versatility in building up your favourite sound: you can mix dry and wet signal as you like. Blending in some of the dry sound helps preserving a sense of the original tonal attack, something very useful in most situations. Very well manufactured pedal, great quality materials, from the chassis to the knobs: high end stuff! I would preferred to have the power supply input on the upper side of the pedal instead of having it on the jack input side of the box, but this issue is maybe just personal. All in all this pedal is really a good value for money. I LOVE IT