I read it sums all the results.

Is there a way to make it pass one result to the next clone?

So it's a chain/stream and not a stack? I.e. taking n+1's inlet from n's outlet.

If no, I'll go ahead and log it as a feature request with Miller. (By the way, does somebody have a link to where I would log such a request?

You can do it with send/receive, like this:

clone-demo.pd
add1.pd

Here it is with $0 protection:

clone-demo.pd
add1.pd

I just realized that it is a bit different in the audio world. I haven't used the audio objects yet.

Here, the signal is send to the clone with the highest ID first:

clone-audio.pd
audio.pd

Here is one version with throw~/catch~, which might be more convenient:

clone-audio2.pd
audio2.pd