I searched. Couldn't find anyone with the same problem:

I recorded some stuff to my gl2. In vcr mode during play back, I used the stock STV cable (one a/v plug to three RCAs). I can see the image on my tv set and can hear the recorded sound through the internal gl2 speaker but the TV is not playing any audio. I tripled checked my connections, and tried the same set up with more than one tv and more than one cable (the STV cable that came with the gl2 and the Monster Cable version). Video comes through, but no audio. I know the audio is on tape, it just doesn't come out of that a/v hole for some reason. This is the first time i have set up my gl2 to do this.

Do any of you know of any settings I should adjust to get this thing going, or is it a defect?!

Thanks

What kind of connections/cables are you using? I remember
(don't have a GL2 myself) something about enabling it to go
out instead of the speaker.