I'm wondering how it's done since i see everyone instantly spamming them whenever something happens like when a rare drop drops. also how do you get sound effects on them since i keep hearing that xD thanks for any advice!
You use the command "/sa#" in your Auto Chat settings, with the # being the number of the Symbol Art you want to use.
I've been trying to add SA to my auto chat but it only shows the SA and not the text. Did something change?
@ChiknAriseMcFro I know we don't have the ability to add auto symbol art for when we have a auto action sentence. For example if you die and go down, a symbol of revive could be used. I been trying for some time but that feature is still not available.
@ERICK001BC Ty for the reply. It took some digging but I found that if you use /symbol# it cancels out everything else. I just added the extra box so RNG decides whether to display the art or my "Help! I've fallen and I can't get up!" text when I die. The symbol art was working by itself. You should try it now.
@ChiknAriseMcFro Cool, that's funny I felt I was the only person who used that saying. I also use Tis but a scratch/Flesh wound for critical hits that don't kill me.
@ERICK001BC Black Knight ftw. I sling out a few French insults for a couple of auto texts. My Quest start is what Google says is the Japanese translation for "I fart in your general direction." I also have a "Your mother was a hamster and your father smelt of elderberries!" 
@ChiknAriseMcFro Nice, I start off "if your going through hell, keep going." Or the rise shining photon (gundam from G gundam) and it sometimes will be the good old, "I choose you."
I had to remove my independence day speech from the emergency alerts for obvious reasons.