Microphone muted when level is set below 8%

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Hi,
  (I am new to the list, not native English speaker and not an expert, so I
apologize for any error or misunderstanding; if this is not the correct
list for my problem thank you for pointing me to the right support list, or
so)

With my ASUS Expertbook laptop, I need to record sound in a very loud room,
so I need to turn down the mic volume, and I do that by the command

amixer -D default set Capture N%

which works fine when N is >=8, but it seems 8% is a threshold because if I
set it at 7% or below, nothing (absolutely nothing) is recorded.

Is there any explanation for that, or any way to troubleshoot the problem?
Unfortunately, 8% is still too high for my use case.

Many thanks in advance for your help!
Best regards
Andrea

[Fedora 40, output of alsa-info.sh at
http://alsa-project.org/db/?f=4d84d2703dc05beb70c93513cf074b7da9310341]

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:monospac=
e">Hi,</div><div class=3D"gmail_default" style=3D"font-family:monospace">=
=C2=A0 (I am new to the list, not native English speaker and not an expert,=
 so I apologize for any error or misunderstanding; if this is not the corre=
ct list for my problem thank you for pointing me to the right support list,=
 or so)</div><div class=3D"gmail_default" style=3D"font-family:monospace"><=
br></div><div class=3D"gmail_default" style=3D"font-family:monospace">With =
my ASUS Expertbook laptop, I need to record sound in a very loud room, so I=
 need to turn down the mic volume, and I do that by the command</div><div c=
lass=3D"gmail_default" style=3D"font-family:monospace"><br></div><div class=
=3D"gmail_default" style=3D"font-family:monospace">amixer -D default set Ca=
pture N%</div><div class=3D"gmail_default" style=3D"font-family:monospace">=
<br></div><div class=3D"gmail_default" style=3D"font-family:monospace">whic=
h works fine when N is &gt;=3D8, but it seems 8% is a threshold because if =
I set it at 7% or below, nothing (absolutely nothing) is recorded.</div><di=
v class=3D"gmail_default" style=3D"font-family:monospace"><br></div><div cl=
ass=3D"gmail_default" style=3D"font-family:monospace">Is there any explanat=
ion for that, or any way to troubleshoot the problem? Unfortunately, 8% is =
still too high for my use case.</div><div class=3D"gmail_default" style=3D"=
font-family:monospace"><br></div><div class=3D"gmail_default" style=3D"font=
-family:monospace">Many thanks in advance for your help!</div><div class=3D=
"gmail_default" style=3D"font-family:monospace">Best regards</div><div clas=
s=3D"gmail_default" style=3D"font-family:monospace">Andrea</div><div class=
=3D"gmail_default" style=3D"font-family:monospace"><br></div><div class=3D"=
gmail_default" style=3D"font-family:monospace">[Fedora 40, output of alsa-i=
nfo.sh at <a href=3D"http://alsa-project.org/db/?f=3D4d84d2703dc05beb70c935=
13cf074b7da9310341">http://alsa-project.org/db/?f=3D4d84d2703dc05beb70c9351=
3cf074b7da9310341</a>]</div></div>

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