My friend made a few machine sounds. Here, check this out. The sounds are free to use, as he stated. Not sure if they'll fit into the game or not, but check them out anyway.

The machine sounds can be found at the centre of the page. The file weights ~78 megabytes.

I'd still suggest to ask him about the sounds, though.

yay.gorilla

@Encrypted
¿Is it the one with two sound files? It sounds like the interior of a research facility, specifically, where the technicians work.

@Pisarz Yeah, that one. It actually has 16 + 1 sounds. These two are the examples.

yay.gorilla

@Encrypted
I haven't seen them all then.