OK, some progress... It seems that the kernel is reporting your Nintendo USB microphone as an output device. And PulseAudio always prioritizes recently-attached USB output devices. So PulseAudio is behaving correctly.
If the microphone is not meant to also act as a speaker then this is a kernel bug.
OK, some progress... It seems that the kernel is reporting your Nintendo USB microphone as an output device. And PulseAudio always prioritizes recently-attached USB output devices. So PulseAudio is behaving correctly.
If the microphone is not meant to also act as a speaker then this is a kernel bug.