SOLVED:
I used PlayOnMac to install 7zip and was able to use that program to extract the file. It gave me a new file called `data` with no extension. I had to then use 7zip to extract that file and it finally gave me the folder with voice in it.
The other part of the instructions that was a little different on mac is that when running the kindletool in the command console in mac you need to run a command like this from the folder where both the kindletool and the voyage.bin file are located
`./kindletool extract voyage.bin extractionFolder`
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