morseCode is a handy program to generate a audio morse code from a text
If you have Go installed and configured (i.e. with $GOPATH/bin in your $PATH):
go install -v github.com/SaDs3c/morseCode@latest
Otherwise download a release for your platform.
To make it easier to execute you can put the binary in your $PATH.
morsecode -t "TEXT" [-o output.wav]