I’m having the exact same issue here, and it’s been driving me crazy.
Recording from the microphone input (tried default and specifying the source manually) records way too fast… the line creeps across the screen, and when I do play it back, it’s just unintelligibly fast.
Changing the project rate to 384,000 Hz helps a little, but it’s still much too fast.
This is using Audacity 2.2.2 from the https://launchpad.net/~ubuntuhandbook1/+archive/ubuntu/audacity repo.
I’ve attached my audio diagnostic output as well, this is on Xubuntu Artful (17.10) on an MSI X370 AMD motherboard. I’ve also added some info from lspci and dmesg on startup.
I also went ahead and booted into a live USB of 18.04 to validate if it was still an issue, and the same thing happened using the same version of Audacity within the live distro.
lspci-dmesg.txt (2.16 KB)
diaginfo.txt (7 KB)