not sure what you mean by "Bounce" track. The Output 1-2 is what outputs to the speakers. If you want to hear individual tracks, solo them, or mute others. Make sure the output of the individual tracks (In Track Mixer or Environment) are set to "Output 1-2." (Filp-menu just above the fader)
Or, if you want to audition individual regions, or audio files, open them in the Audio Editor (or matrix editor for MIDI regions) by double-clicking the region in an Arrange window.