I recently completed my newest machinima where I used several sounds from freesound.org. It was suggested I post the link for the video here too, so here it is
A new rocket design later and Kerbal Space Program Mission Control is ready for the rendezvous to bring Jennie back to Kerbin, but staying true to Kerbal culture, not everything goes according to plan.
Rendezvous is a sequel to my other machinima, Orbital, http://youtu.be/EMdYl6tK13o where I also used several sounds from Freesound.
Big thanks goes to the freesound community. This website is a great resource for anyone that needs sounds!
Enjoyed the video.
I wanted to thank you for being thorough with your attribution.