EqP (Equal Power Crossfade): Results in an equal power crossfade. This minimizes volume dips between audio regions, resulting in a more even crossfade between regions that may be slightly different in level.
X S (S-Curved Crossfade): Delivers an S-curved crossfade. The fade curve, as the name suggests, is S shaped.
The last three items in the pop-up menu can only be applied to two consecutive regions. Also note that the Fade In (and corresponding Curve) parameters are made redundant when any of the X, EqP, or X S options are chosen.
In Logic Pro, do one of the following:
For a fade in, choose the Speed Up parameter, and modify the value.
For a fade out, choose the Slow Down parameter, and modify the value.
Logic Pro offers Speed Up and Slow Down parameters in the Region inspector, which you can use to speed up or slow down the playback speed of fades. These parameters share pop-up menus with the Fade In and Fade Out parameters.
Control Surfaces Support Guide: PDF