Mac Pro no analog audio input

The analog audio input on my Mac Pro has stopped working.  Audio output still OK; USB audio input works fine but nothing from analog audio input.
I know it's getting a signal as I can send the mixer output to a Zoom H4n and it records fine, but I need it to go directly into the computer for tutorial voiceovers.  I've tried recording in Quicktime Player, Soundtrack Pro, Camtasia and Screenflow.
I get no volume indication in the System Preferences>Sound panel.
I opened Apple Midi Setup>analog input and I can adjust volume on the two channels but "Master" is stuck at zero.  Could this be the problem?

See if a smc reset shakes it loose.
Just to be clear here.  Are you inputting into a program and expect to hear it as well? If so, then unless the program itself has some kind of audio playthru to the speakers you need a app like LineIn to handle that function.

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