audio recording needed?
Looks like I'll have to sample it with my sound card or something and then post a capture. To be more specific, the distortion only happens on those channels, that I can tell. Same TV, if I use the same inputs, from a DVD player, to play, say, Star Trek 2, no distortion occurs. So I don't think it's a problem with the TV.
Since the audio and video stream coming into the DirecTivo is digital, it is impossible to insert this kind of distortion into the stream. However, it is possible when transcoding (i.e., DirecTV receiving it at one sample rate and re-encoding it at another sample rate), or also during converting to audio format. I doubt this is the problem, or I would see it for all programming and not just Star Trek.