Concerning audio fade-in & fade-out, there is a little problem in my opinion, I suppose it’s the same concerning audio level using image-keys. Sorry if there is already a topic about this, I didn’t found it.
If you add and audio clip in a project and apply a fade-out filter on, let’s say 10 seconds, the fade out is already done in something like 1 second. Because our ears work in logarithmic and shotcut seems to work in linear. Could it be possible to switch to (or add) a logarithmic mode? Because It changes totally the feeling of mixing and fadding.
The workaround I use is to export the audio clip to Audacity, proceed the fade-out and import back to Shotcut, but it’s only a workaround