Thankfully, my little digital recorder works as I expected in creating multi-track song files. My goodness - what I can do from here.
I own Cubase, which is a multi-track music production software package. I can take audio files and mix them together. It's pretty decent. So while the boys are sleeping I created a simple vocal piece (totally made it up on the fly) and then recorded a separate harmonizing piece for it. Then a percussion track (me slapping my leg...) Three tracks, and then blended them all together with Cubase. Ho ho! It worked. I've never done anything like this, so I'm thrilled.
I'm playing a lot today and trying new things. Fun!
ETC: And because it's 128 bit, I can put it into this little player. Click twice to get it going...