Ardour and Muse both seem descent. There are a lot more free ones, but it may also be worth checking out making audio in a markup language or using something li

Ardour and Muse both seem descent. There are a lot more free ones, but it may also be worth checking out making audio in a markup language or using something like csound. Here is a good list of software available by default in Arch: https://archlinux.org/groups/x86_64/pro-audio/ https://archlinux.org/groups/x86_64/pro-audio/