Audio will not play in timeline

After editing my transcoded canon c100 .mts files in FCPX, suddenly the audio stops playing in the timeline. Project preferences are on "stereo", source media is set to "all", not just video. Clips will play fine in browser. The audio has come back a few times on its own in the timeline and then disappears again yet the waveforms are always visible in the clips. Any ideas? Note, I have a damaged headphone jack, currently I'm only to get an audio signal from an external device (headphones, ext. speakers). I would doubt that has anything to do with this problem but who the **** knows.
Yosemite 10.10.2, MacBook Pro 15" Late 2011, 2.5 GHz Intel Core i7, 16 GB 1333 MHz DDR3, AMD Radeon HD 6770M 1024 MB
FCPX 10.1.4

I just realized what my problem was.
I apparently (by accident) clicked the little mute button
that appears in the timeline. Stupid.
Thanks,
PL

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