In order to hear the notes of a certain chord, you will have to open the "chord builder" to listen to the actual chord.

If you are talking about the chords you enter into the main Biab chord cells, you have to press the "play" button to generate the style that is selected to play over the chord changes currently entered.

If you are not hearing anything there, check your midi driver in and outputs.

Please elaborate on which function of Biab you are trying to use, thanks.

Trax