The Semod includes the 12VDC power harness and smoked dust cover. The power required is 12 volt DC 100 ma. The RCA input may be driven with most organ sound generators. Four RCA outputs allow you to configure the crossover (slider routing) dip switches for full range, two way (bi-amping), 3-way (tri-amping), or 4-way (quad-amping) systems. Harrison Organ Works suggests using their Travelling Wave Generators on each output for thrilling mulitudes of phase or quantity of "pipes" and chorus effects. The adjustable level pink noise generator makes it simple to set up the sliders by ear or using a sound pressure meter. There are 30 LEDs (one for each slider) that light when 20 db of head room remains and are useful for calibration and setting the two input sensitivity pots. You may purchase the SEMOD without the LED display. If multiple SEMODs are used on a particular organ channel, each one can be set for different voicing such as Romantic or Baroque.  