Suspend or resume the specified sink (which my be
      specified either by its symbolic name, or by its numeric index),
      depending whether 1 (suspend) or 0 (resume) is passed as last
      argument. Suspending a sink will pause all playback. Depending
      on the module implementing the sink this might have the effect
      that the underlying device is closed, making it available for
      other applications to use. The exact behaviour depends on the
      module.