Use the FireBox Mixer. The Firebox Mixer is for monitoring only and is independent of recording software. Any levels set within the FireBox Mixer are only what you will hear. They do not determine what your recording software will record. The FireBox Mixer allows you to audibly listen to all input channels and mix it with software playback. You can independently assign which software playback channels you will mix; which channels you will monitor with your headphones; and which output channels you can send the mix to. The FireBox Mixer also gives you panning, muting and soloing control for every channel.