1 and 0 the user interface of fig1 shows a user interface when the audio bridge of the invention is used in a multimedia environment the user interface of fig1 also assumes that the conference is conducted in a peer to peer mode i e each participant can control the gain elements associated with the output that he she receives from the bridge on each user 39 s display is shown a still or motion image of the other participants in the conference below the image of each participant is a u201c talk u201d button 1001 and a slider control 1002 a user can toggle talk button 1001 on or off to enable or disable transmission of his or her voice to the person whose image is over the talk button 1001 a participant uses slider control 1002 below a person 39 s image to adjust up and down the incoming audio volume from that person advantageously the user interfaces of fig9 and 10 are simple intuitive and fully implement the talk and listen matrices of the gain matrix described above while some aspects of the present invention have been described as a linearly controlled system only the amplitude or gain applied to the input signals from a participant could also be non linearly controlled so that the dynamic surge from all input signals is more consistent additionally the principles of the invention could also.