ZDoom

This is basically the inverse of the problem I faced after GZDoom dropped FMod support. This is assuming you're running Windows:

-Download OpenAL Soft Win32/64 Binaries here: https://openal-soft.org/#download
-Extract the zip somewhere on your PC
-Run alsoft-config.exe from the folder with the same name
-Check "Enable Gain Limiter"
-Set the Sample Format to 32-bit Float
-Hit Apply and you're done

You could try creating a [url=https://zdoom.org/wiki/SNDINFO]SNDINFO[/url] and use $limit to reduce the amount of times a specific sound that can play at once.

This cannot be done. Modern sound engines are very bad at evicting sound channels properly and it'd also pose a significant hazard to modders because they'd have to be aware of such a limitation when designing their sound.

As far as I know, this is not possible. However, there may be ways to run the sound though an audio compressor or something similar in order to decrease volume variation.

When playing maps with many monsters it is nice to be able to reduce the number of sound channels in order to avoid hurting my ears when many monsters wake up at once. Currently the minimum number of sound channels allowed in gzdoom 3.7.2 is 64. Is it possible to allow gzdoom to reduce this number further to 8?