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The grunt switch is still present, as you would expect. From Darkglass The Microtubes B3K v2 has a current draw of 20mA. Only use a regulated 9V DC adapter with a center-negative plug. Due to ecological reasons it does not accept batteries.
The overdrive is a sound that is an amplifier over driven. and more.It is not a distortion, and it is not a fuzz. the overdrive is one of the best over driven bass sounds from many pedals that I listened to. The potentiometers have a wide range. The mid boost and the grunt (Bass Boost) do not add too much of a volume boost; the boost switches just add a little more tone to the overdrive. The overdrive sound is musical. The right amount of overdrive for me.