How do I listen to stereo audio?

Here's a post from audioasylum that should help you out: Posted by Michael on November 05, 1999 at 07:45:21: In Reply to: Re: Need Help:How can I connect a pre to Theta Casanova posted by Joly on November 04, 1999 at 22:11:12: Joly, Are you attempting to add a dedicated 2 channel preamp where you would use the that unit for music and the CasaNova for HT? If that is the case, then it is not really not that hard to accomplish. You can do this in several different ways. One of the easiest ways is to purchase a 2 channel preamp that has a unity gain feature. A unity gain is essentially a pass through where the incoming signal is passed directly through without being affected by the gain of the preamp. Take the front L&R preamp outputs, from the CasaNova, and connect them to an input on the 2 channel preamp. Connect the preamp L&R outputs, from the 2 channel preamp, to your amp as usual. If the 2 channel preamp does not have a unity gain feature, then you could use the tape monitor capability and if all else fails, simply use any available input on the 2 channel preamp. In the last case, you will have to set the 2 channel preamp volume knob to a known position, which should be as high as possible, whenever you want to use the CasaNova, for HT. Also, keep in mind to calibrate the front L&R speaker levels, through the CasaNova, noting the volume knob position on the 2 channel preamp. I hope this helps.

Oh, also some prepros do have analog passthrough. But their digital bypass will not give you the best analog stereo possible. You can use what you have and follow the tape monitor method in the above post.

John, that's essentially a unity gain as I described above. As far as I know, no Levinson pre has it.