That's simple. Open one of GWorkspace.app's file viewers, select the files or diretories, and drag them with the mouse to the "Data" section of Burn's main window.
As files are not ordered, it makes no difference where you put them.
It is currently not possible to drop files into a directory already in the resulting file system, but only below the top level item. While files are simpy inserted into the data section, directories are treated differently depending on how you use the modifier keys when dropping them onto the compilation window.


The usage of modifier keys

• If you simply drop a directory without pressing any key at all, the directory will appear as is in the compilation window. The effect is that on the resulting CD you will find exactly this directory on the top most level containing the same structure as on your harddisk. The result looks like this:
  
  
  Directory "Cddb" has been dropped without any modifier and is included into the compilation with its original structure.
  
  
• Dropping a directory while having the 'Control' key pressed (this is the 'Link' operation) will insert the files and directories from within the dropped directory into the compilation. This means that the contents of the dropped directory will be on the top most level of the CD's file system. The dropped directory itself (it's name) will never appear. The result looks like this:
  
  
  Directory "Cddb" has been dropped with the 'Control' modifier pressed. Hence the directories contents appear in the compilation.
  
  
• Dropping a directory while having the 'Option/Alternate' key pressed (this is the 'Copy' operation) will make Burn recurse through the whole tree and insert all files in a flat structure into the compilation. All directory levels will disappear. The result looks like this:
  
  
  Directory "Cddb" has been dropped with the 'Option' modifier pressed. Hence the contents of the complete structure appears flattened in the compilation.
  
  

That's also simple. Again, open one of GWorkspace.app's file viewers, select the audio files (of type wav or au), and drag them with the mouse to the "Audio" section of Burn's main window.
As audio tracks will appear in a certain order on the final disk, you must drop the files on the line where you want them to appear. Please note, that you have no influence on the order of a set of inserted files, i.e. if you drop more than one file at the same time, those files will appear in an arbitrary order.
Actually, the audio files need not have the name extensions ".wav" or ".au". Burn will accept all files as containing audio material. However, Burn will be able to derive the audio format from the file's name extension only if it is a wav or au file. In all other cases you must use the Track Inspector to assign the proper audio file type to the tracks. Audio files must contain 16-bit stereo sounds, sampled at 44.1 kHz. Otherwise they cannot be burned as audio tracks to a disk or will be misinterpeted. While files are simpy inserted into the audio section, directories are treated differently depending on how you use the modifier keys when dropping them onto the compilation window.


The usage of modifier keys

• If you simply drop a directory without pressing any key at all, the directory will be ignored . A directory cannot be an audio file!
• Dropping a directory while having the 'Control' key pressed (this is the 'Link' operation) will insert the files from within the dropped directory into the compilation. Again, diretories inside the dropped directory and their contents will be ignored.
• Dropping a directory while having the 'Option/Alternate' key pressed (this is the 'Copy' operation) will make Burn recurse through the whole tree and insert all files in a flat structure into the compilation.

To add tracks from an audio CD, you need a CD player application being able communicate with Burn using Drag-and-Drop. Open the player's track list or play list or whatever feature it offers, select the desired tracks, and drag them with the mouse to the "Audio" section of Burn's main window.
As audio tracks will appear in a certain order on the final disk, you must drop the tracks where you want them to appear.
Modifier keys while trying to drop an audio CD track will not be accepted.
Currently, there exists only CDPlayer.app as a suitable CD player application.

You may as well use the offered service 'Burn To CD' from those applications that can supply the appropriate pasteboard data (see also 'Services.../Burn To CD').