This is a good suggestion. Nevertheless, my suggestion is just another matter. Only recently I had a track with lots of clips, each one with an individual setting, and I wanted to reduce the overall volume of this track. I used the following workaround: I exported the said track as a wave file, and I inserted this file as a new track while muting the original track. Now I could change the volume using the envelope. It works, but it isn't a pleasant way to go. So. I would like to see a volume slider for the whole track, as we have it in Audacity.