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The missing cache sounds are from script function LAi_CharacterPlaySound, found in the program scripts of your mod.  You need to add the missing sounds to sound_alias.ini

[cache name]
prior = (default is 128 if missing)
minDistance =
maxDistance =
volume =

Read the FMOD documentation for how to set priority (prior in the .ini file), minDistance and maxDistance.  The engine uses FMOD_MODE = FMOD_3D_LINEARROLLOFF.  If the "prior" settings are not set properly, many sounds might be "stolen" or "virtualized" by all other sounds that are playing with a ranking priority.  The mod is responsible for setting these things properly.

https://documentation.help/FMOD-Studio-API/FMOD_Channel_SetPriority.html

https://documentation.help/FMOD-API/FMOD_Channel_Set3DMinMaxDistance.html

https://documentation.help/FMOD-API/FMOD_MODE.html

FMOD_3D_LINEARROLLOFF This sound will follow a linear rolloff model where mindistance = full volume, maxdistance = silence.

You might also want to adjust the number of virtual channels in the start.ini.  Read about Virtual channels:  https://documentation.help/FMOD-API/FMOD_System_Init.html

start.ini

[sound]
...
...
virtSoundSlots = (default is 1024 if missing)
virtSoundSlots maximum is 4093