To record vocal harmony, the most basic thing to do is have a human sing each part and put those parts on their own tracks in audio recording software. If you can do it that way, it is arguably the best and most preferable method of doing it.
But you can also create harmony recordings using software.
There could be several reasons, like:
There are several programs available that are specifically designed to create vocal harmonies. Two of the most popular are Antares Harmony Engine (brought to you from the makers of Auto-Tune), and Vielklang Instant Harmony. There are others, of course. These programs work really well. But they can be a bit pricy. Harmony Engine is $199 and Instant Harmony is $149.
If you don't have a couple hundred bucks in your budget for this, there are a couple of other options. Reaper, one of the best and most affordable recording programs around, comes with a couple of different plugin effects that you can use to create harmony. One of these is called ReaVoice. I did a video on how to use it here. The other one is called ReaTune.
The primary use of the ReaTune effect is to correct pitch, very much like Auto-Tune and similar programs. But you can use the pitch-altering ability to create harmony notes from a single track of actual vocals. You can see how it works in the video below. But in a nutshell...
This is a lot more clear in the video here:
This video is an excerpt from our course Harmony Recording Awesomeness. Find out more about that by CLICKING HERE.