My family used to have a cabin that was at a lake several hours out in the mountains and pretty isolated except for a few rich people who lived up there. Place was, and I shit you not, infested with Sasquatches.
Every 4th of July I would go up there to watch the rich people light off their fireworks and immediately after, I had found a logging trail that a large group of them would gather with their babies and all. I think to watch the fireworks. They'd let me get a little bit closer every year until my family sold the cabin. The last time I went there I took a couple friends and they chased us out of the forest until a car's headlights scared them off... That's also the most scared I've ever been.
For obvious reasons I don't want to share the location of this lake..
I've never actually heard them vocalize anything. I've heard them whistling and the time they chased us out of the forest they made this like expelling a ton of air sound.