quicktime-java

Hi.
I am writing small broadcast based on LittleBroadcast from Streaming quicktime 
with java
http://www.onjava.com/pub/a/onjava/2005/01/12/strmng_qtj.html
by Chris Adamson.
Problem is that recorder audio is presented on speakers and causes unpleasant 
feedback - you know, this squeaky sound.
I am out of ideas how to switch that off without switching of speakers 
absolutely.

I attach part of code:
-----------------------------------------
    Presentation pres
    int BROADCAST_WIDTH = 176;
    int BROADCAST_HEIGHT = 144;
    int presenterTimeScale = 600;
        String filename = "broadcast.sdp";
        QTFile file = new QTFile(new File(filename));
        MediaParams mediaParams = new MediaParams();
        mediaParams.setWidth(BROADCAST_WIDTH);
        mediaParams.setHeight(BROADCAST_HEIGHT);
        QDGraphics myGWorld = new QDGraphics(new QDRect(BROADCAST_WIDTH, 
BROADCAST_HEIGHT));
        mediaParams.setGWorld(myGWorld);
        PresParams presParams = new PresParams(presenterTimeScale, 
QTSConstants.kQTSSendMediaFlag |
                QTSConstants.kQTSAutoModeFlag | 
QTSConstants.kQTSDontShowStatusFlag, mediaParams);
        pres = Presentation.fromFile(file, presParams);
------------------------------------
Thanks for any kind of help,

Jan
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