GnuRadio 3.10 - Audio sink under Linux does not support stereo

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I have the packages for GnuRadio from the default Ubuntu Noble repos.


I try to create a flow graph with an audio sink with 2 inputs, to do
stereo. The flow graph compiles, but when it runs:


RuntimeError: check topology failed on audio_alsa_sink(43) using
ninputs=2, noutputs=0


Has anybody actually TESTED that an audio sink will work with 2 inputs
and generate stereo?