Being able to hear players voices affected by the audio effects of Dynamic Surroundings and/or Sound Filters would be an awesome feature to have. Having the echo of a cave be heard in someones voice or the total silence of a room make the voice pop. Right now, the voices are seemingly unaffected by any audio altering mod.

Dynamic Surroundings
Sound Filters

My knowledge on coding is null, so I don't know how simple or complicated this would be.

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I noticed this suggestion was made two times prior and learned that this mod does not use Minecraft's audio engine. My apologies.