Hi Pastor Troy,
A warm welcome to the forum from me too.
i have had the t4 tone match system with the LT2 for years. Recently purchased the t8s with the F1 speakers.
I take it you mean the T1 in this case as it's not been out for years. This may however not be all that relevant although the T4 and the T8 have much newer technology than the older T1.
‘When the bank is all ran through the board. Bass, drums, vocals, piano, guitars. And we are playing hard, we get a loud digital scrambled noise. I’ve heard it in another post with similar situation they said it was like an alarm with a dead battery.
This sounds very much like a digital circuit being overdriven and distorting. Analog amps/preamps based on valves don't show this anomaly, but do however start to distort earlier than digital ones. This starts as a gentle distortion which many people find to be "warm sounding" until the distortion becomes really apparent. Digital circuits however remain distortion free until a certain threshold is reached. After that they distort in a very horrible way like scratching, as you describe "an alarm with a dead battery."
‘We tested this. And was able to replicate it by everyone playing hard and all vocals hitting in microphones hard.
Any idea on what is causing it
I may be wrong but this is where I would start looking, especially as you state that you were "able to replicate it by everyone playing hard and all vocals hitting in microphones hard."
Have you checked the output level meters on the front panel when this happens? If you're more than maxing out here you certainly shouldn't expect everything to sound normal.
Have you set up the input gains (trims) on all channels to make sure that your input signals aren't too hot when the loudest signal that each instrument/vocal is present?
Have you tried to mute each channel separately at the parts of the song which are causing problems to see if it's maybe only one channel causing the problem?
Have you tried to record the the main outputs where the problems occur to see if the problem is apparent before you go into the F1's?
You could also try putting the T8 through the L1 Model II analogue input (if you still have it) to see if you're distorting there.
These are just a few suggestions which you may already have tried out, but a long distance diagnosis is always difficult. Getting to the source of a particular problem is quite often a case of trial and error, and trying to isolate the source of the problem.
Maybe this has been of some help and maybe not, but this is how I would be trying to solve the problem/anomaly.