I suggest you to give a chance to this command in a terminal, which may result in some audio being gathered from the proper device (/dev/video?) and routed to the sound output. Additionally you may need to change your /dev/video? for the proper one.
tvtime option --device /dev/video1 | arecord -D hw:1,0 -r 32000 -c 2 -f S16_LE | aplay -
You can change 32000 for some other audio sampling rate that your computer is able to play without problems. Valid Audio Sampling Rates starts from 8000 and a comprehensive list of sampling rates is provided right here: http://en.wikipedia.org/wiki/Sampling_rate
Somehow, redirecting the tvtime to the proper device (/dev/video?) will result in the audio also being redirected from/to the right way.
In order to know which devices you can use you may wish to use this command:
Which will result in a list like this:
geppettvs@DYLAN:~$ ls -l /dev/video*
crw-rw----+ 1 root video 81, 0 2012-04-21 09:58 /dev/video0
crw-rw----+ 1 root video 81, 1 2012-04-21 09:59 /dev/video1
so you will know which devices are available to be used by tvtime (or other software).
I hope this help you or somebody else.