Is there any way to duplicate TV channel to have in effect two copies of one channel with different audio stream (i.e. two different languages). I tried to make a copy of channel, and then change audio stream in it. Unfortunatelly that change affects both channels. Is there any other method to solve my problem?

You can try change sid parameter in channel property and scan again.

Unfortunately changing sid doesn't help. Any ideas how to solve the problem?

Prog wrote:You can try change sid parameter in channel property and scan again.

Stations / channels are identified by SIT + TID.
If you edit one for fake IDs, to a combination, that should not exist anywhere else (like both as 8190, probably), you should find the original back at a transponder scan. Set the modified one to not update.
If doing a full scan, the fake entry will be listed as lost. But you don't have to mark it there to be deleted.