Re-editing and re-compacting doesn't always fix it, I've found. However, using the EyeTV "Export for Toast" function does seem to get the right soundtrack every time. Why it is sometimes the audio description soundtrack that gets picked up when you try to Toast the edited and compacted programme direct from EyeTV I don't know. (Using MPEGStreamClip allows you to choose which soundtrack to listen to when you play the raw. Looking at other EyeTV programmes suggests that most/all Freeview broadcasts have this second, mono soundtrack but in the majority of cases it is silent. The other week I burned a DVD of "Legally Blonde 2" direct from EyeTV which turned out to have the audio description soundtrack rather than the actual movie soundtrack on it (which was a little confusing, until I realised what was going on!) De-multiplexing the EyeTV programme using ProjectX revealed two separate mpeg audio tracks: the actual soundtrack which was stereo and the audio description track which was mono. I think the reason for the lack of sound is to do with the audio description soundtrack. EyeTV however blaim Toast which may/may not be the case.
If mono then simply go back to EyeTV and re-edit/recompact. If you transfer to Toast and check the "edit", have a look to see if it is "mono" or stereo" - the former is silent and the latter ok. I think this is an EyeTV bug, when I "edit" recordings to remove adverts and then "compact" about 20% lose their sound.
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