[Avid-L2] 5.1 monitoring

I've been given am AC3-5.1 file, which I imported into Symphony 5. But I can't hear it. The fine manual says I should be able to listen to a stereo version since I don't have any 5.1 hardware. It's the same sample rate as the project - 48. Indicates 6 channels. No waveforms when I put it on the time line. The file plays in VLC Media Player. System audio is good, playing everything else. Just not this 5.1 file. Any ideas?

Curtis Nichols
Señor Editor
PCS Production Co.
Irving, Tx.
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