A while ago I used Audacity to record the output from the computer speakers by using PulseAudio Volume Control to redirect the output to the "microphone". It worked fine. I then used Effect > Change Speed and saved the result. It all worked fine.
Since rebooting, I repeated these steps to capture some more audio output but without changing the speed. Nevertheless when I played back the result it was slower and lower in pitch. I then used Effect > Change Speed to increase the speed and that seems to have fixed it but at a cost in quality.
It is as if Audacity is applying previously used effects to new recordings, even in a different instance of the program. This seems bizarre, is that what's actually happening? How can I stop it?