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...ayback and speex_echo_cancel in a multi-threaded application, as suggested in the manual. Though, the cancellation works properly when i use a file with human voice for far-end input and the same file with echo added in SoundForge for mic input. When i try to insert and remove silence between words modellng delay variation (about 10 ms) in the mic input file, the echo canceller doesn't make any significant change in the signal. The same happens with real microphone input, looks like it's due to the delay variation which naturally happens due to operating system processing and such. Is the echo...