Version 5.0.9, which I'm currently uploading to the server, can import and export multitrack songs as EDL files that are compatible with other multitrack audio programs, including Vegas, Samplitude and Reaper. Actually the program saves in two different EDL formats, one in a format compatible with Vegas (that uses the .txt extension) and one with Samplitude (.edl).
While none of these EDL formats are the ideal format for exchanging songs with other programs, as not all of the information normally stored in n-Track's .sng files can be written to the EDL files (for example effect plugins settings are not included), the song structure (i.e. wave files that made up each track with their exact offsets and lengths) is preserved.
This should be useful for those users that use n-Track along with other programs or that want to collaborate on multitrack recordings with other people using different programs.