Electrix Filter Factory For Sale. Analog High Order Filter MIDI Effects Processor. Want to morph your audio signals through a great, flexible stereo analog sounding Moog type resonance filter? Look no further! You can use this Filter Factory with any audio signal - keyboards, drum machines, turntables, etc. There are lots of features absent from most other analog filters, like buzz (distortion) with buzz and trim parameters, LFO with MIDI sync capability and various waveforms, envelope follower, multiple filter types (lowpass, highpass, notch and band pass modes) and full MIDI implementation - every knob and button transmits and received MIDI controller info! IT even has frequency CV inputs. This machine is no joke - and it sounds great too!