Yea someone told me the same to use a isolation transformer with
polarity switch and 3 to 5 isolation outputs to not get ground
loops and impedance mismatching.

Ok so know we seen it from an impedance out look

But another way i see it is Tone because if i daisy chain or
Triple Y cord 3 different amps like a matchless amp to a fender to
a marshall those are all three different impendances that are
mismatched and the preamp section has a different VOICE design
so with daisy chain set up your putting the 3 different VOICINGS
designs in series where with a triple Y cord the 3 diffrent
voicing preamp designs are in parallel.

I guess its like 3 different frequecy response in series with
daisy chain and for Y cord is like 3 different frequency response
in parallel. Because the guitar is not just seeing the impendance
its seeing more past the impendace the design reactance of capacitance i would think by 3 different voicing either parallel
or in series.

Someone told me either the preamps can have a POLARITY im not
sure what that means really is the impendance out of phase then?
i know some of the preamps in fenders the outputs of the preamps
have a polarity and the output of the preamps is out of phase
from the normal channel to the vibrato channel. But if you daisy-
chain or Y cord amps we looked at the impedance of the amps in
both ways but what about this Polarity then?

I know Jimi Hendrix use to have a Triple Y cord setup and Daisy
chain this is SERIES/PARALLEL impedance and voicing designs

So the guitar sees
1.) the impedance either in series or parallel or both
2.) sees the polarity of the impedance
3.) and sees the capacitance of the preamp Voicing

The polarity im confussed about ?
and the Voicings of preamps im confussed about?

Thats alot for your time and information about this