The <code>request_params</code> can usually be empty, but if a key <code>help</code> or <code>info</code> is present, the rendering module will provide usage information.
</p>
<p>A special feature that has been requested for Virtual Reality (background music, instructional speech, operator's voice) provides a sound source and sound receiver create method that will only be effective for the given <i>rendering instance</i> (explicit renderer). This is required if ambient clips should be played back without spatialization, or if certain circumstances demand that a source is only processed by one single renderer. This way also computational power can be saved.
