You can enable autotune in Audacity by installing the GSnap plug-in, which works with Windows, Mac, and Linux computers.

You'll want to use Audacity's background noise removal tools on a small bit of audio at first, then expand it.

Use GarageBand or Audacity to digitize analog music for backup and playing on devices. Record your music in the digital audio workstation and edit your audio as individual tracks. Export your files ...