Audio in through headphone jack, out through USB?

Hi community, hoping you all can help me solve an audio puzzle. I currently play iTunes through a USB digital audio convertor connected to powered speakers. The system works great (especially with the "remote" app to control it). However, I would like to play my TV's audio through the same USB device. I have an oldish macbook pro. I've confirmed that the headphone jack can be used as input and made this selection in system preferences, where I have also selected the DAC as the output. The TV out is plugged in to the macbook headphone jack and I can see the audio registering on the little meter in the audio input preferences but I cannot get it to pass through to my speakers. I've reset the PRAM and SMC and I've fiddled with audio MIDI setup to no avail. Perhaps this just isn't possible but I'd thougth I'd ask for help here before I gave up.
Oh, and before someone suggests it, the DAC only has USB input, no other options.
Thanks.

Have you tried using another HeadPhones ?
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Michael,
Thanks. I haven't mixed down the audio or checked the number of tracks in Prefs. Good points.
As far as a mixdown goes, I'll definitely give it a try, though I wonder whether or not the tracks will be recognized during mix down recording - given that you can't hear either of those segments in playback. Just have to try.
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Have you tried using another HeadPhones ?
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****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
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Audio in through headphone jack, out through USB?

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