The FT201 is capable of providing ultra low and high frequency filter effects which are controllable with the on board infrared expression controller, which allows the user to create filter sweeps by moving their feet or hands over the pedal. The FT201 has 3 different filter outputs: band pass, low pass and high pass, which all work simultaneously. The cutoff frequency range is very large, between 20Hz and 20 kHz and because of the vactrols used the sound quality is superb. The 10 Step Sequencer runs through the selected amount of steps (2 - 10 steps) and adds the control voltage to the value set by the cutoff knob, thus modulating the cutoff frequency in every step.
With performance in mind when designing the Poltergeist, KOMA Elektronik included large Pan knobs for total control over the 360 degree range field. Also, clickless solo and mute buttons allow for effortless and instantaneous changes on the fly. Beyond these controls, you can also tailor your sound with extreme detail using functions such as Slope, Field and Origin. With just this mixer, some audio sources and a couple of LFOs, extremely complex sound design can be achieved.