I've just purchased a Sony GX210 dvd recorder, so far (1 evenings play) I'm really happy with it. However I've noticed that on playback of purchased pre-recorded films the sound is very quite, turning up the volume only increases the background hiss as well. The tv is old and is not 5.1 compatible, does anyone know if this is the problem and how i get around it? I have no problem with the sound coming from my sky box and no problem from things that i have recorded from sky. I'm using a scart lead to connect to the tv.