Bug: using headphones loopback as a recording device (Windows WASAPI) doesn’t work. It works in Audacity 3 with the same settings. Here, in Audacity 4, it works through laptop speakers loopback, but the headphones only record a buzz sound and it’s only on the left side of the stereo.
Feature-request: when the audio clips can overlap now, the most helpful feature in the world would be for the clips to automatically create crossfades. Also in general, creating fade-ins and fade-outs could be much easier than it is now (dragging the upper corners of the clips, as Ableton does it for example)