Dear Experts, anyone have an idea on what the constant beep is at arond 6:15? it usually appears with a yellow box around the altitude, and during descend phase will disappear when landing gear is deployed.
I would personally want to have a way to disable that annoying beep and enjoy flying manual as in emergency case where AP fails
[The reason for the beep is,] You’re not following the Flight Director…
O, so in such case anyway to disable the flight director and fly manually? I usually like to detour a bit, and that I think the ATC instruction should be same as the FD?
Airbus isn’t designed to be flown manually. Manual flying is only reserved for emergency situations where the flight computers are malfunctioning. On normal situation, airbus isn’t designed to be flown manually that way.
That being said, you are flying manually, that means you need to disable most of the flight computers subsystems like Flight directors, turn off the flight controls ELAC and SEC and FAC, A/THR off, AP off, etc etc.
If you want to have a detour, you program the detour into the MCDU and the plane should fly the detour for you.
But to go back to your annoying beep sound. Just press the Master Warning button. I know it isn’t lit, but pressing it would stop the beep.
@KinkedoNau1 , The long tone you are hearing is your altitude alert warning. You are drifting away from your set altitude in the FCU. Reset your altitude lower (or higher) and the noise will go away.
If you set the altitude in the FCU for 7,000’ as you have, if you deviate away from that altitude either above or below, you will hear the aural alert tone. The only way to clear it is to either re-set your altitude with the FCU altitude knob, or recapture your set altitude.
I tried to press on that but it doesn’t work, maybe it’s the dev mode doesn’t work that way, or any buttons I can disable to flight director then?
I got that sound before, but pressing the master warning button silenced it. But I am on the experimental version.
One other thing, as @Neo4316 stated, if you really must fly the A320 manually, which of course you can, it’s a sim - Just turn off the FD (Flight directors) as well. Note that you lose a significant amount of built-in envelope protections flying like this. It’s not “The Airbus Way” 
The sound is not related to the master warning and pressing it will not silence it. If it does, it is incorrectly simulated. The Master warning emits the characteristic “Calvary Charge” sound. This is the altitude alert tone. He needs to either turn off is FDs, or adjust his altitude knob on the FCU to match his actual altitude.
No, it certainly isn’t a master warning but pushing the master caution button (just below the “master warn”) does silence the altitude warning tone. EDIT - just correcting info it is actually the master Warn button you use)
Also turning of FDs doesn’t change control laws, you don’t lose any related protections and you remain in normal law.
If the Master does indeed silence it and it is intended to do so, I stand corrected. However, the question - and the reason for the aural alert - Is based on his deviation from the altitude set in the FCU. I think it’s important the OP understands why they are hearing the sound as they were not sure in the post.
That’s plain and simple wrong
It’s a really bad advice and completely wrong to suggest to turn ELAC, SEC and FAC off.
AP off for manual flying is sufficient, some companies require you to disengage A/T as well.
FD OFF is unfortunately a bug in MSFS since it doesn’t remove the mode indications
@PZL104 - Thanks for additional confirmation on that. It’s exactly what I thought but there are others here who believe it does. I understand it doesn’t as well.
That’s the altitude deviation caution, correct, but IRL it’s not a continous tone.
YEP! It’s very annoying in current implementation. But not an issue if you fly the Airbus correctly
I love how threads like this descend into semantics. The proper answer to the OPs question is simply this. He is hearing the aural tone because he deviated from his altitude. How to silence it, if you can, is a completely separate issue. Why would we teach how to defeat something without sharing what is creating the condition in the first place?
Because the OP doesn’t care why it’s happening?
I was replying to a comment where you corrected someone and said you can’t silence it with the master warning button. I added info on top of that saying you can use the master button to stop the tone… I don’t see why that isn’t adding value to the thread and certainly isn’t semantics.
I also added some info that corrected a misconception you appeared to have regarding the FDs and control laws.
But then how would they fix it the next time if they don’t know what’s happening?
They would push the master again to silence it.