My audio playback is totally messed up

I'm on 10.14.6, with a very fast CPU, an SSD drive with plenty of room, and lots of available memory (64Gb). I've had this problem before, it's triggered by a brief outlet power blip *even though* my computer and every peripheral is on a good UPS. I have no idea how the computer itself doesn't notice the power issue (it stays up and running) but the audio system does... But what I need right now is ideas on how to fix it. I have several USB microphones and this affects them all. When I do a test recording (with Zoom, with Audacity, whatever), the levels show that the microphone is hearing sounds, but the playback is either perfect copy of my speech BUT repeated many times over (and sometimes stepping on itself), or, horribly garbled audio that sounds like a dying robot.. I first killed and restarted coreaudiod, and then rebooted the whole machine, and it's still doing it! I was using Soundource (and mostly it works fine) but now I exited it, and it's still happening. How do I fix this? Last time a reboot fixed it, but not now.