#3
i think digital pedals rely on computers to generate the sounds and analog rely on the old style circuits and wires or something...not sure.
#4
analog its the way its sounds really (were physics involve) and digital is produced by computer chips (think of an analog and digital watches, analog watches work mechanically were physics gets involved and digital like i said is a less complicated system but sacrifices the natural sound)
Fender Strat 60th Anniv HotRoded
others

Marshall 1980 JMP 2203
Marshall JCM900 1960A Cab
Valve Jr.

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EHX Small Clone Modded
Maxon OD-820
MXR 1978 Flanger
Digitech Whammy
TC Polytune
Custom LPB-1 Boost