For four or more players.
Players assign themselves positions in a virtual circle.
Using two different communications devices, players make an audio connection to the players on their left and right, but no other players.
Improvise in this trio.
One possible setup for this might be to use two phones and use one ear bud from each.
Using a mixer would also be possible, but heapdhones are still advised to prevent sounds from the distant players reaching each other.
Just using a real telephone is fine, but any audio software will work.
If everyone is using two mobile phones, call recording software running on every single one of them could potentially be mixed together to make a large piece, but it may be that this piece is only meaningful to participants.
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Have you tried playing it? How did it go? Were you able to record it?