What does it mean when the manual states “DRY OUT Jack – This 1/4″ jack outputs a buffered version of the input signal.”?

To put my question in context, I would like to plug the output of my guitar into a pedal and take two outputs, one of which will be pitch shifted an octave below. The shifted output will go off to be processed as a bass guitar and the dry output will then go through a guitar rig as normal. Two products seem to be possibilities: the Micro Pog and the Octave Multiplexer. Among their differences is the fact that the Pog uses the sentence above to describe its dry out, whereas the OM states “DRY OUT Jack – This jack is connected directly to the Input Jack.”

So, what is a buffered output? Does it simply delay the dry output by a fraction of a second so that it is in phase with the processed wet output? Why do these pedals use a different type of dry output? If all other things were equal, what questions should I ask myself when I decide whether a buffered or a “true bypass” is best for my needs? (The pickup I currently intend to run through it is an active EMG – I imagine that could be useful to know.)

Thanks in advance!