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This cute but rare creature comes from a time, when software still had a hardware shell. The 4-pole’s basic purpose is to process any audio signal with a 24db low-pass filter, identical to the one the Waldorf MicroWave uses. Its complex modulation capabilities can be used not only to control cutoff frequency and resonance but also to manipulate volume and stereo-position of audio material. And its comprehensive MIDI-implementation lets you conveniently control it from any keyboard or sequencer.