And they need to be sure that they are listening to the previous person's work as it really sounds.
But, isn't the idea of exquisite corpse, that you don't know what the stuff before is?
Or on the contrary, you may decide to exploit interferences between patches as an extra source of fun. Indeed that would make the whole thing more interesting and justify the concatenation of patches rather than just of wav files :)
That's a good point , it would be best if there were aspects making it fundamentally different from concatenating peoples sound files, hmm.