Je ne sais pas pour les wav mais pour les mp3 c'est possible et ça doit être le même principe, je te met une FAQ sur l'import mp3 :
How can I import and export MP3 files?
The import of MP3 files can easily be done by using drag and drop from a standard file browser (e.g. Apple Finder, Windows Explorer, Total Commander) or directly from the desktop into the Sequel project. As soon as you drag an audio or MIDI file into the Sequel project window, a small "+" symbol and the position within the project appears next to the mouse pointer. When the mouse button is released, the dragged file will be placed into the project. If you use MP3 files, it might take some time for Sequel to decode the file.
The export of MP3 files from Sequel is unfortunately not possible. If you need to have a smaller, encoded file you'll have to use the "Export to iTunes" option (has to be installed separately on a Windows PC system). The exported file will be an AAC file.
Alternatively, you can of course export your mix as a wave/aiff file and let any third party application encode it into MP3.
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