Multimode Filter

The original modular synths allowed signals to be routed through four different types of filters: Highpass, Lowpass, Bandpass, and Band Reject (or Notch). These filters were called Multimode and were the real tone-shaping part of the original analog modular systems. When Moog and ARP introduced the MiniMoog and Odyssey respectively in the 1970s, neither had a multimode filter. The MiniMoog had only a lowpass filter, while the Odyssey had both lowpass and highpass filters. Multimode filters did not make a comeback until more recently. Native Instruments, for example, has introduced Multimode Filters in its Kontakt 3 operating system.