The Levalator may not be necessary if all VP audio ciips are normalized. To easily test that...
Select all the clips with <ctrl-A>. Click the fx button on any audio clip. Click the large green + sign and choose NORMALIZE.
Click the fourth button from the left on the effects toolbar, the one whose pop up reads Replace Effect Chain in Other Selected Clips.
If you still desire an external app, export the project. Then open with WavePad, which will prompt if you want to continue as an audio file. Answer yes to discard the video.
Once that's done, either tweak the audio with WP or SAVE AS in the format of your choice, which can then be passed along to other apps.