As described earlier playlists are one of the central objects in a digital audio workstation. A playlist is a list of regions ordered in time. It defines which parts of which source files should be played and when. Each track in Ardour is really just a mechanism for taking a playlist and generating the audio stream that it represents. As a result, editing a track really means modifying its playlist in some way. Since a playlist is a list of regions, most of the modifications involve manipulating regions: their position, length and so forth. This is covered in . Here, we cover some of the things you can do with playlists as objects in their own right.

It is important to understand that a track is not a playlist. A track is a mechanism for generating the audio stream represented by the playlist and passing it through a signal processing pathway. At any point in time, a track has a single playlist associated with it. When the track is used to record, that playlist will have one or more new regions added to it. When the track is used for playback, the contents of the playlist will be heard. Old tape operators will feel comfortable thinking of the playlist as the tape, and the track as the tape machine. However, you can change the playlist associated with a track at (almost) any time, and even share playlists between tracks. There is more on this below.

One thing you should be clear about is that playlists are cheap. They don't cost anything in terms of CPU consumption, and they have very minimal efforts on memory use. Don't be afraid of generating new playlists whenever you want to. They are not equivalent to tracks, which require extra CPU time and significant memory space, or audio files, which use disk space, or to plugins that require extra CPU time. If a playlist is not in use, it occupies a small amount of memory, and nothing more.

If you have a background in audio engineering, then it might be easiest for you to think of playlists as "takes". This isn't a particularly useful analogy by itself, and it can be misleading. But if you are working with music where most tracks feature single-pass recordings of a single instrument, then the idea of using one playlist per "take" can make life very convenient. Each time you need to record another take, create a new playlist list first. You will then end up with a simple way of switching back and forth between each version, or even listening to several at the same time. If you have some experience of other DAWs, then you might have come across the term "virtual track", normally defined as a track that isn't actually playing or doing anything, but can be mapped/assigned to a "real track". This concept is functionally identical to Ardour's playlists. We just like to be little more clear about what is actually happening rather than mixing old and new terminology ("virtual" and "track") into confusing terminology.

At this point, all operations on playlists start by clicking on the playlist button (labelled p) in the control area of a track in the editor. Clicking the button will popup a menu with the following choices: Current shows the name of the current playlist used by this track Rename pops up a dialog that allows the current playlist to be renamed New creates a new empty playlist, and switches this track to use it New Copy creates a new playlist that is a copy of the current playlist, and switches this track to use it Clear Current removes all regions from the current playlist Select pops up a playlist browser to manually choose which playlist this track should use

Playlists are created with the name of the track of which they are associated, plus a version number. So, the first playlist for a track called "Cowbell" will be called "Cowbell.1". This name will be used to define the names of any regions added to the playlist by recording. You can change the name at any time, to anything you want. Ardour does not require that your playlist names are all unique, but it will make your life easier if they are. Suggested examples of user-assigned names for a playlist might include "Lead Guitar, 2nd take", "vocals (quiet)", and "downbeat cuica". Notice how these might be different from the associated track names, which for these examples might be "Lead Guitar", "Vocals" and "Cuica". The playlist name provides more information because it is about a specific version of the material that may (or may not) end up in the final version of the track. If you are going to rename your playlists, do so before recording new material to them.

If you click on the "Select" choice of the playlist button menu, a dialog will appear that displays all playlists in a tree-structure (many will be hidden). Playlists will be grouped by the track for which they were created, with all those created for the current track displayed. Other tracks are hidden in a collapsed tree that can be expanded as you wish to find other playlists.

It is entirely possible to share playlists between tracks. The only slightly unusual thing you may notice when sharing is that edits to the playlist made in one track will magically appear in the other. If you think about this for a moment, its an obvious consequence of sharing. You might not want this kind of behaviour, even though you still want two tracks to use the same (or substantially the same) playlist. To accomplish this, select the chosen playlist in the second track, and then use New Copy to generate an independent copy of it for that track. You can then edit this playlist without affecting the original.

You have several choices here. You can obviously record new takes directly over an existing one, because of the non-destructive nature of digital audio editing. You can also use the Clear Current operation each time you want to start a new take. This is a non-destructive operation that removes all existing regions from the current playlist. Although you won't lose any information doing this, its probably not appropriate unless the last take was so awful that you want to discard it (although without the finality of Remove Last Capture ). Finally, and probably most useful, you can use the New operation in the playlist button menu to create a new empty playlist, ready for the next take. Later, you can Select your way back to previous or later takes as desired, either in this or some other track.