Ok,
This is noob question but I have seen some very detailed setups for pod hd connections for Amps.
What I usually do is
connect guitar to guitar input
Connect output left (mono) to the guitar in on amp.
Change the setting to live on back of pod.
Change the setting to stack front or combo amp front (depending on what rehearsal room I am in )
Sometimes it sounds good , sometimes it doesn't .
What is the reason for the 3 cable and 4 cable methods of connecting to an amp?
If it can give me a better sound I am all for it but unsure of why people are doing this. Please forgive my lack of knowledge in guitar amps .