Short description of error
I don`t know if it is limitation or bug, but if you change any parameter in modifier, it is not visible until you change time.
Exact steps for others to reproduce the error
- select Y Location curve in F-Curve
- change "y =" parameter
- cube stay without move until you play animation
Same happen in all modifiers. Sometimes it is good if you have feedback immediatelly ;)
Btw. it would be awesome, if there will be some modifier for offseting channels. So animator can use same animation clip, but only with same offset for translate X, some another offset for translate Y .. etc.