There may not be anything you can do a bout this I'm not sure.

You should be able to set a dimension not to spawn any mobs though i think..

I thought that was the case when i tried using dreadful dirt to create a mob farm inside, and it refused to spawn any mobs..

• could be hard coded into dreadful dirt I'm not sure

But after repurposing the cubes for storage and other things.. I've noticed that mob sounds are a problem it sounds like hundreds of mobs are outside of the cube. Which for me personally kind of makes the cubes a bit annoying to work with..

They shouldn't be playing louder in the box than they are outside, so I'll investigate further

ARE hundreds of mobs outside the cube?

ARE hundreds of mobs outside the cube?

I can't confirm or deny. The FTB map doesn't generate anything for the dimension it's just blank (as best i can tell)
I tried warping through the wall which made me instantly and uncontrollably fall to my death at which point i was thoroughly annoyed (void) and even with creative mode, /god and flight on it still forces me down and i die

So i can't figure out how to test that.

Right, the hyperbox dimension is void on the other side of the wall, I mean are there hundreds of mobs out in the "parent" dimension where you placed the box

I wasn't going to play today, but this got me wondering..

I went back and checked, the box is placed above my mob farm.. now i didn't think anything of this because the sounds are muffled in the overworld.

Turning the farm off stopped the sounds inside the box. go figure.

Mob sounds are working as intended