Hiya, thanks for the feedback! I haven't touched this thing in years, and had somewhat forgotten it existed.
If you wanted, you could use something like a virtual audio driver, JACK, OBS, or other tools to route the audio from this app to a recording (it would need to run for the full length you wanted to generate, though). I also made a MaxForLive version of this tool a while back that allows using this in audio performances in Ableton Live, and would allow rendering arbitrary length audio files faster than realtime as a side-effect. If you happen to be an Ableton Suite user, I have added that file as a download option for the project today.
It would definitely be more convenient to have an in-app configuration to render an output audio file faster than realtime, but I never considered the use case where I wasn't just running this on my computer :P If I ever dig this project out for an update, I would look into adding that.