It seems Alex is working on something. But it also seems that all multichannel output results in a feedback loop when changing the output channels of connected parties. And this feedback loop still remains if the connection is closed.
Since Alex did change a lot for the multichannel stuff, there might be several bugs in there, some of them probably introduced by trying to solve the known ones.
I would say that currently only one or two channel operation works.
Feel free to try the multichannel output, but don’t be astonished if it doesn’t do what it is supposed to do.