Make channel selection easier
Channel selection is especially difficult on new hi-dpi screens (though the signal display quality is very good
I would suggest a new technique: when the signal display is focused, and the ctrl key is down, highlight the nearest line in blue, and a click will toggle its selection. selecting a few channels this way will be significantly easier than the current mode, where one has to position the mouse precisely on the signal.
Maybe though, there is an option in the Qt graphics scene on how it calculates mouse over, so that a larger tolerance can be used on hi dpi screens? that might be a lot easier to implement.