Developing multimedia applications with  JMF         T.G.Venkatesh      
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JMF Control
•The JMF API has defined a number of interfaces meant for controlling  attributes of various JMF objects. 
•Example ...
ØGainControl : enables adjustment of audio signal gain.
ØTrackControl : This interface is provided by the Processor to query, and manipulate the data of individual media tracks.
ØBitRateControl  : used for specifying parameters to control media bit rate.
ØBufferControl : used to control the size and threshold of buffers maintained by certain JMF objects.
ØCachingControl : an interface supported by Players that are capable of reporting download progress.
ØFormatControl : This interfaces is implemented by objects which supports  setting of media format.