remove an audio stream from another stream

[Enrico Caruso]

hello everyone, 
This is my first post in the GStreamer-devel Mailing List, so first of all I would like to thank everybody for the good work on this open source framework. 
I have two audio streams: stream1 and stream2. Stream2 contains also a version attenuated and delayed of stream1. I'm searching a way for delete stream1 from stream2. 
How can I do that? 
Thank you 		 	   		  
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