If you go where they are spirits and they are talking, and your
particular recorder is prone to picking up spirit voices (EVPs) (which
many are), then yes, you will most likely get their voices on the
recorder. It isn't an exact science, though. Some recorders pick up
EVPs better than others, some locations are much better at recording
than others, and you need to be good at listening to hear some of them.
(It is best if you can hook your recorder up to the computer, download
the contents and then play the audio through headphones and listen
carefully.) As an example, if I go to the Bijou theater in Knoxville
with a Sony ICD-B16 digital recorder, I can record and interact with
spirits any time. If I try to do it at my house, even with a Sony
ICD-B16 recorder (which is a very good recorder for this), I won't get
anything since my house isn't haunted (unless something just happens to
be passing through.) Also, if I go to cemeteries, I can usually get
some EVPs (although not every trip, but most of them), but the voices
from the cemeteries are usually more of a whisper type instead of full
fledged voices from my experience. At the haunted house I went to in
Rogersville, TN and the Bijou Theater in Knoxville, TN, there is just
pretty much non-stop full fledged voices that were not heard at the
time of the recording.

Sean Dudley