The Slow and Fast settings both divide the Input frequency going into Spooky2 Central. The resultant frequency is always an exact Octave harmonic of the input signal. This adds to the effectiveness of the plasma.
The Slow setting divides the input frequency into a slower signal. The ultrasonic may become audible and annoying for some users, so we recommend using the "Fast" setting in most instances.
The ultrasonic transmitter can work independently from plasma. You can unplug the plasma tube and run the ultrasonic only. In this way, slow entrainment frequencies can be run. A "Slow" setting will ensure the ultrasonic transmitter will run at these lower frequencies.