What are EVPs? 
EVPs or Electronic Voice Phenomenon is how Spirits often can be heard by those who cannot normally hear Spirit using a simple voice recorder or dictaphone. It is rumoured Spirits speak between 6-19dB the average hearing of a normal person is 20dB and over, the peculiar thing I experience is that as I am partially deaf in my right ear this surprisingly is the ear I hear them from.
Below are a few recordings of Spirit voices captured during readings and at other times.

What are ITCs?
ITCs or Instrumental Trans Communication is another method of spirit communication, using electrical devices or other more natural things such as water, smoke, rain, white noise, radio sweeping, and wax. 
Spirit often can reveal themselves more audibly or visibly especially useful for those who cannot physically see or hear spirit. ~ Karen