heh, if wanna more and indepth info, just key in "analogue ______ definition (fill inthe blank with your choice of effect), you will have enough info to read, for the next 3 months.
Let's just say..
Using digital effects make your signal go from A to B.. Meaning it is totally different..
Using analog effects make your signal go from A to A'.. Meaning it was just modified..
Haha.. Stupid way to define.. Just google it lah.. Got plenty of good information!