disposition_map.insert (pair<ustring,ImportDisposition>(_("one region per file"), ImportDistinctFiles));
disposition_map.insert (pair<ustring,ImportDisposition>(_("one region per channel"), ImportDistinctChannels));
disposition_map.insert (pair<ustring,ImportDisposition>(_("all files in one region"), ImportMergeFiles));
+ disposition_map.insert (pair<ustring,ImportDisposition>(_("all files in one track"), ImportSerializeFiles));
chooser.signal_selection_changed().connect (mem_fun (*this, &SoundFileOmega::file_selection_changed));