Blakemore Effects Bi-Polar Octadrive
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The Bi-Polar Octadrive uses the Mustang Overdrive as its base tone, and it has the same controls for volume, gain, bass, mids, and treble, but the Octadrive includes an added footswitch so you can engage an octave-up effect that can be used in conjunction with the overdrive. A dual color LED let's you know whether the effect or octave are on or off.