garageband
[youtube https://www.youtube.com/watch?v=EJyvSpgL-5E&w=560&h=315] Note: if you uncheck ‘Compress’ you should be given the option to export as a WAV file.
[youtube https://www.youtube.com/watch?v=nx2rCeiteB4&w=560&h=315]
[youtube https://www.youtube.com/watch?v=zjZXXjuJKJ8&w=560&h=315]
[youtube https://www.youtube.com/watch?v=CFlcLTqzIR8&w=560&h=315]
[youtube https://www.youtube.com/watch?v=TYynioOpkGU&w=560&h=315]