encoding audio reminder

Dear Gentlemen,

i have developed a PC application that stream and receive audio to a 
remote embedded device, in an half duplex fashon.
Everything works quite fine now, except for a little problem:
I have the following operation sequence:
TX1) I start to capture and sending audio chunks to the remote device.
RX1) I stop to capture, clear someway captured samples, and set the PC 
application in RX mode.
TX2) I start to capture again, and sending udio chunks to the remote device.

The second time i start to capture and send (TX2), seems i am sending 
still a chunk of old session TX1.

I try to add some code:

I open the capture device at application startup.

TX ()
{
    alcCaptureStart( capture );

    AudioThread (true);
}

audio thread read and send now

RX ()
{
    if (capture)
    {
        alcCaptureStop    (capture);

        ALCint remainder;

        alcGetIntegerv    (capture, ALC_CAPTURE_SAMPLES, 1, &remainder);

        int block;

        while (remainder > 0)
        {
            block = (remainder)>512?512:remainder;

            alcCaptureSamples    (capture, &buffsamples[OFS_PLD], block);

            remainder -= block;
        }

        /**
        * this clear every AL error, so that next "alut" functions don't 
fail,
        * in particular "alutCreateBufferFromFile" need a clean start.
        */
        alcGetError    (capture);
    }

    .... RX init code
}

Is there a way to be sure i am not reading/capturing old samples still 
in AL buffer from the previous capture session  ?


many thanks in advice,
Angelo


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