&inputchannels=N tells the audio capture device explicitly to select N-number of audio channels.
Setting &stereo=0 will set &inputchannels=1 by default.
If using &proaudio you want want to disable stereo-audio capture, particularly if you are using an XLR to USB microphone preamp that has two channels, but only one microphone connected.
For example, if a guest joins and you can only hear them in the left or right channel, either add &mono to the view-link or add &inputchannels=1 to the respective guest invite-link.
Mono-specific alias
If looking for a memorable parameter to set a guest's audio input to mono (1-channel), &monomic is the same as &inputchannels=1. This was added in VDO.Ninja v22.
