Ok, here's a screen shot showing several different things in Mixcraft 5
Notice at the top of the screen that you can select clip volume or several other things that can be altered along the length of the clip like clip pan, etc
Once you select something at the top, the line that show up in a clip are related to what you selected at the top
So, if you are working on pans, the blue dots are left and right pan points
Here, I have selected clip volume at the top of the screen
When you click on a clip, you can add dots/points to whatever function you are working on.
You can change volume, pans, etc
You can then grab those points you added and pull them up or down
You can change volume levels during playback to whatever you like all along the whole clip.
Look at the clip on the bottom. I pulled the volume level up and down several times
Notice how the last blue dot on the right is pulled down to zero
That is how you fade out a clip
The dot to the left of the last blue dot is where the fade out begins.
You have to add a dot at this point or you would be fading out the whole clip from the start point or the last dot you added.
You can control where each track starts to fade out and how long it fades out.
You can put the dots anywhere on a clip and control sections that may be too loud or you may want to pan the clip left and then right, etc
Mixcraft 5 also has track automation controls for volume, pan and any effects you may add, but that is a subject for another day.