With SoundManager you are able to control multiple sound channels of one or multiple sound cards.
It uses ALSA to speak to the sound cards.
An example how to use SoundManager would be a shop or store with multiple rooms where every should have its own speaker. Then with SoundManager you would have a single web interface where you could control every single speaker.
SoundManager also allows to create different playlists and assign them to one or multiple sound channels. It is also possible...