I said in the last room we were in. The one where we had the options of W,S,E and had sounds of binary laughter.
I said that because we came from the south, and we were able to enter the west exit without being devoured. I assumed then that the laughter came from the east exit (and that the laughter only travels one room module).

N,N,W, N, E, N,W,N,E.