Audacity is a open source sound editing software. This application lets you import, record, mix, and render multiple tracks. Audacity is not as robust as professional applications but it provide basic editing functions at not cost. You can download audacity at this link. Follow the installation instructions for your selected OS. https://www.audacityteam.org/download/.
Audacity is available on all in-house library desktops and circulating laptops.