Stereo or mono?

There is no default setting. Simply choose between stereo, mono or whatever you need. I believe that most of us track in mono. But if you like to track in stereo of course you have to choose a stereo track in ProTools.

You can record how ever you want but I agree with kempermaniac mono is the way to go

Yes, only one cable when tracking mono. Does your audio interface provide SPDIF?

Regarding stereo image: Anything that's mono is lacking the stereo image. But the stereo effects of the KPA are summed to mono so they still can be heard and of course tracked.

Don't know about the converter but SPDIF is another usable output for tracking and it keeps the signal all digital without AD/DA conversion. Also you're maybe interested in "reamping" (lots of threads about this here in the forum).

I disagree about mono

Personally i record anything that has any kind of stereo effect like delay, reverb, chorus etc as stereo. The only thing i record as mono these days is a dry distorted guitar. No real reason not to these days.

I always track all my guitar parts in mono and add any effects in the DAW itself. That gives me much more flexibility in assuring that everything "fits" the way I want it to, because what sounds good solo often doesn't work well in the overall mix.

The KPA before the post FX is mono in general. Just like most preamps. The signal path of stereo effects doubles the mono signal so you have two sources of the sound, which you need for stereo. So, as stated above by Kempermaniac, running only one side (think: source) from the output can never be stereo at all. That being said, you need to decide, wether you might want to add stereo effects in your DAW afterwards. Though I don't know Protools (nevertheless sure there is a way to put stereo fx on mono tracks in there somewhere), I'd recommend s/pdif, too. Since your Interface has an optical dig in, you will need something like this:

http://www.amazon.de/Coax-Tosl…r-Konverter/dp/B00548PAR6

I did not test that one in particular myself.

In pro tools record to a mono track then, make a stereo aux track send both these to the main outs. Put a stereo effect like reverb, delay chorus etc then on the dry mono recorded guitar track open a send which is bussed to that aux. now you can blend the stereo effect with your mono guitar track and adjust to take

Quote from chamelious

I disagree about mono

Personally i record anything that has any kind of stereo effect like delay, reverb, chorus etc as stereo. The only thing i record as mono these days is a dry distorted guitar. No real reason not to these days.

I guess you're in the minority with your approach but if you're 100% confident about your time based FX why not print them when recording.
In fact I want to experiment more with printing FX on the go for a more spontaneous and raw performance, like you do.