Cinelarra has two versions: the unsupported community version and a commercial edition. Every six months the nice Cinelarra developers release the latest source code. It’s not widely available in the usual distro repositories, but the good Cinelerra-CV folks bundle it up into Arch, Debian, Fedora, Ubuntu, and other distro packages. There is a Cinelarra PPA— Personal Package Archive– for Ubuntu users. PPAs are user-supported repositories for specific applications, like Cinelarra. They’re not official repos, but they allow you to use your normal Ubuntu package manager to install and remove third-party software.
Audio and video clips can be linked together and managed as single clip. Another thing that I personally find useful is that Pitivi can be used in different languages and has a very extended documentation. Learning how to use this software is easy and doesn’t require much time. Once you get used to it, you will be able to edit video and audio files with high precision.