CentOS6: Sound Prefs, How To Limit Output Volume To The Un-amplified Range?

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Hello there,

recently installed CentOS6 on a (quite old) 64-bit system, and from the GNOME’s sound preference app, I can see that the Output volume range is said “amplified” from 63% to 100%. Below 63% it’s unamplified.

No idea what’s implied behind this amplification (I don’t see this on other desktops), but I notice that when “amplified” the sound is pretty bad (at 100% and above, it’s ridiculously bad). Below 63% it’s simply very good and from far, loud enough.

I wonder if there’s a way to make the amplified range (63-100+)
inaccessible? It makes no sense to me to allow the amplified range if it sounds bad (tested with different external speakers).

lspci says, about the device:

00:14.5 Multimedia audio controller: Advanced Micro Devices, Inc. [AMD/ATI] IXP SB400 AC’97 Audio Controller (rev 02)
Subsystem: Hewlett-Packard Company Device 2a2f
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- SERR-

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