First thing you need to know is that most electronic and pop styles of songs will be in the A440 tuning, about 99% of songs are. So it is a good chance your songs are as well. Where you might want to check is with the rock styles. If this is something you want to do, there are ways to do it over the internet, apps, and sites that you can check your songs with.
There are some free tuner apps available for Android phones like DaTuner (Lite!) and gStrings.
You can change the tuning to various
frequencies and test it.
There are several apps available for iPhone. When looking into an app just make sure that it gives you the
ability to change the tuning frequency from 440 Hz to 432Hz or whatever your desired
You can also go the tuner route. Most people prefer to buy a Chromatic tuner, like this one: Korg Chromatic Tuner
Just a tip: if you decide to go the tuner route and you find it jumps all over the place, it is most likely that the track that you're listening
to is fast paced and has percussion mixed with music. what you need to do is find a section of a track where there is only
singing or music playing (without the drums) and check the frequency
there. This is because there is a higher change in these points, and your tuner will be able to
pick up the tone where there is not much going on.
The songs being loaded into the R432 software would need to be in the 440 tuning because the software is coded to take a 440 song to 432. If your song was not in 440 then it would be lowered incorrectly and thus would not come out in 432Hz. If you think it has come out wrong then check the original tuning. But as said at the beginning most of songs are in 440.