A one channel audio stream is always treated as a Mono signal. It will appear in a Virtual Room as one positionable virtual source with its own directivity and parameters. In many ways, Mono signals are the most straight forward format to work with in a spatial composition. This is because a one channel signal discretely contains all its acoustic and spectral properties without inter-channel dependencies, such as those found in a wide stereo image for example. In practice, such point sources are easier to localise and balance spatially with others.
★ Mono sources are simple to work with when balancing a spatial mix