How to use unix executable file if double clicking it doesnt work?
If it is meant for command line use, you should type all the required info in the command line. For more help, run these two commands in Terminal app.

cd ~/Downloads/sonic-annotator-1.5-osx-amd64
./sonic-annotator --help



https://unix.stackexchange.com/questions/397524/what-does-the-mean-dot-slash-in-linux/397528#397528
https://unix.stackexchange.com/a/4432/359891


Many tools provide README, docs or similar files which contain examples of usage. 

Also I found the examples of usage in the online docs here, in case anyone wants to check it out: 


https://code.soundsoftware.ac.uk/projects/sonic-annotator/wiki