There used to be a version of SnapZ Pro or earlier similar product by same maker;
http://www.ambrosiasw.com/utilities/snapzprox/ however it may not be available.
Years ago, I'd used their product known as WireTap to save audio files; it had a
free version or one that ran indefinite in demo mode. It was fun...
Contact the maker (by email?) and ask if they have old versions; even w/o support.
Looking through their site, I don't see the comparable older Snapz ProX on first look:
http://www.ambrosiasw.com/sitemap/
http://www.ambrosiasw.com/forums/
"If everything else failed or if you need additional assistance"
Send a Question to Our Support Team- Ambrosia Software
Most of these kinds of things were about their peak before the advent of Intel-Mac
in about 2005. Other options may be equally difficult to find in the vintage you seek.
Also, avoid those which were build for use in the early Intel-Mac, as they shipped with
their own version OS X 10.4 Tiger; unlike later 10.5 Leopard that had different features.
There are two versions of Tiger, one for PowerPC hardware, other for Intel Mac builds.
So avoid software only intended for early Intel builds, running their first as-shipped OS X.
Old software online may be of questionable legality or could contain other bad items
along with their download; or not contain anything at all like you hoped. Be careful if
you see something that may sound like the thing you want.
The example of 10 applications for Mac OS X (earlier reply) is an old page but any links
still working that go to product appear to show the latest or from OS X 10.7 to present.
You may need to consider a later model computer for such items, something that runs
at least Snow Leopard, 10.6.8 and research if what you want to do still is made for it.
Good luck! 🙂