[center] 
1.) The upper part shows information about the current selection/sample,
2.) The middle part allows you (with either selection or loop), to set the size, add to size, subtract from size, or move to left/right by frames, seconds, % of selection, % of loop, % of preset or % of sample, defining the anchor point (the point that stays fixed, while the other end gets moved to accomodate the new size) as outer left, inner left, center, inner right, outer right of either selection, sample or loop.
The move left/right buttons are separated to point out that they ignore the anchor, but that kinda falls down because of the checkbox, which toggles clipping and applies to basically everything. Let’s say you move a selection to far, or increase its size too much - should the selection then be truncated to respect the boundary, or should it be moved back to respect the target size? That’s what clipping is (I guess ideally there should be a third option, “do nothing”)
3.) The lower pane allows you to store and recall presets (here you also select the preset to be used with “% of preset”)
Notes:
– There is some sample rate conversion going on. If you select the first 10 seconds of a sample with one sample rate, store that as preset, and recall that preset on a simple with a different sample rate, that will be converted (same thing if you use “% of preset” in combination with a preset that has a different sample rate)
– The target (selection or loop) toggle applies to transformations as well as to storing and recalling presets.
– You can start as many instances of this thing as you want, they are independant of each other (which is the reason I decided to not store presets etc. in the preferences, too confusing imho, you can’t have everything ^^)
Well, I hope that didn’t scare you off 
Enjoy!
