The input source default selection is "S/PDIF" (digital input) when the MicroTrack 24/96 is first put to use.
Here is how to change the input source from S/PDIF to the analog inputs:
1. Push the Menu button
2. Select "Record Settings",
3. Select "Input Source"
4. Activate 1/8" or 1/4" TRS, depending on which of the analog inputs you are planning to use.