Re: INQUISITION PERK EXPERIENCE bUG.
Wow okay, so when I first messed with Cheat Engine I wasn't paying enough attention and didn't notice that Influence XP wasn't reset to 0 each time it increased in level. This means that lowering it enough will decrease my Influence rank! I was originally trying to re-level to level 21 in case something bugged the first time around however it seems rank 21 isn't supposed to be reachable, in light of recent information the Influence Rank Cap is 20 and the game probably shouldn't be allowing Influence to continue to accrue once you hit Rank 20.
I found a solution to the annoying audio issue, however it isn't the most ideal solution because it allows you to continually grind additional Inquisition Rank points to spend.
In order to fix the sound effect issue you have to use software such as Cheat Engine to lower your Inquisition Rank in the game and then Save your progress in-game before walking anywhere (because the game will crash soon after you try to walk more than 20~ steps in any direction, this is presumably because you've tampered with the game process and the game presumably has anti-tamper technology).
I lowered my Influence to 150,000 which caused my Inquisition Rank to fall to 17, saved my gameplay, quit/crashed the game and then loaded up the game from the desktop and continued from the newly created Save File without further issues. The sound has now stopped being played any time I close a menu or Fast Travel, Huzzah! Reaching Rank 18, 19, 20 etc. again will give me an extra Inquisition Rank point to spend (only downside to this "solution").
Presumably the problem may re-occur when I again hit Inquisition Rank 20 but I can again lower my Inquisition Rank to keep working around the issue if the problem arises again.
You can use this Cheat Table with Cheat Engine to manipulate your Influence (unsure if it exclusively works for the GOTY Edition): https://mega.nz/#!q5w0HSSB!YlHi2KiCqPyDsfHh0bz_ppNrrkpXQJbJjDfN1LKC8r4
1) Open the game and load your Save File.
2) Open the Cheat Table I linked to above, with Cheat Engine.
3) Click the flashing button (top left) in Cheat Engine to bring up a list of software processes.
4) Select the games process.
5) At the bottom of Cheat Engine should be a selection of things you can tweak that pertain to gameplay elements.