I was listening to Missile Command's music, and really liked it, so I decided to export it to a .wav . I selected patterns 0-19 and, in the terminal, type the command:

EXPORT MISSILECOMMAND.WAV

The result was, indeed, a .wav file, but played around a quarter of the first note of pattern 19. That's it. I'm quite annoyed since the menu music in Missile Command is very good, but that's not the point. The point is there's a bug.

That's really odd!

So, like, what's always worked for me is to go to the beginning of the track I want to export in the Pattern editor, hit ESC to go back to the command line with that and not the SFX tab open, and then type export whatever.wav. I think it's supposed to start from the same music pattern that would play if you hit the space bar and then record each pattern in turn, following repeats, until it hits a stop or about 4:30 of record time. If that doesn't work, I don't know what to try next.