Tuner and player audio unfortunately do not follow the same path within the DSP. The tuner audio is not present on the inputs to the soundcard (digital outputs of the DSP). We've verified this several times. This is a disappointment, but that's just how the DSP is set up. If you need to listen to the tuner, you will have to connect to the analog RCA outputs on your sled or rear outputs on the unit itself.

Hope this helps,
Stu