It's been a few more months, and the Sound Siphon website seems unchanged, and has no updated info regarding Big Sur support. Since the other poster has not provided any information, I'm assuming they haven't heard anything either. Considering that in years past, the developer was always responsive, and updates were very timely: makes me wonder if the company went under, or the developer passed away. I've had that happen with apps before and didn't find anything out until a year or two later. (AppDelete example here) As I mentioned in a previous comment, I've purchased AudioHijack to replace Sound Siphon until further notice. I had no problems with SS, but since there has been no info about what's going on that's been released. I needed to have a working compatible app to use when needed. So if Anyone who reads this, has any updated info at this point, would appreciate it. Thanks By the way, when I looked at all the software StaticZ produces, NOTHING has been updated in a long time, not just Sound Siphon, at least from what I've observed looking at the website.