You can use audacity to record audio coming out of your computer - just change "MME" to "Windows WASAPI" next to the input/output device settings.

Then, play audio from generative.fm and record it for 1-2 hours. You can export to MP3 or WAV when done.

I did something similar (but with OBS) in this video where I remixed music from the game Mirror's Edge Catalyst using Sonic Pi - https://www.youtube.com/watch?v=gQ8dD5Bz3_E

Personally, I like the generative aspect.