No volume options seem to change the volume of Explosions with Gnomefathers.

[Blazer1001]

I am so happy Gnomefather's is back and this is just a slight issue. The only thing that affected the sound of explosions was the General Volume level. Moving Effects down only changed the sound level of my gun. Are there any files you would like me to attach for this?

[Aslain]

I don't think you can do anything about it, except for playing with volume sliders in the game options. You may want to contact the author in his topic and ask about it.