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Used and in Excellent ConditionMulti-Mode Dual / Stereo Filter with individual Resonance ControlKarl is an analog multi-mode filter that is loosely based on the KORG MS-10 and MS-20 filters, but has been improved to handle two mono or one stereo audio source. The Resonance can still be varied independently per channel, which is very interesting when using two different audio sources at once. If you want to merge the two audio sources there is a Mix Out next to the two independent outputs per channel.Karl has four modes:• Low Pass Mode: Classic Analog Low Pass Filter• High Pass Mode: Classic Analog High Pass Filter• Phaser Mode: A small band of frequencies is filtered next to the original signal being passed through• Overdrive Mode: If Resonance is increased the filter will quickly jump to overdrive, which creates some nice HarmonicsThe Modes may be changed via jumpers on the back of the module.In any mode the Cutoff Frequency may be changed via CV. The CV signal can be attenuated with the CV potentiometer.Details:• Analog Dual/Stereo-Filter• 4 Filter Modes: LP, HP, Phaser and Overdrive• Independent Resonance Control• Mix two Mono Signals• Mono to Stereo Converter• CV Control over Cutoff Frequency• CV Attenuator• Wrong Polarity ProtectionExpander for ST Modular Karl Stereo FilterThe "Karl Mode Selector" gives you front panel control over the modes and alternative audio input for the right chanel that can be activated via switch. Modes: Low Pass, High Pass, Phaser Mode, Overdrive Mode