[vdr] Not able to switch off comment for blind people in splitted Stereo Signal

I just switched over the german channel ARD showing a movie in 2 Channel Audio.

Channel A the normal Movie Audio Channel B the Audio for blind people

Though I tried to switch it in the Audio Menu (Cursors left right for left and right channel) nothing changed I always had to listen to the descriptive Audio for blind people too. Because my digital audio receiver has no possibility to switch between channel a or b.

Shouldn't there be something implemented to switch the Audio Channel on TV channles choosing not to use two audio pids for splitting the audio modes but by splitting the Stereo Signal.

Thanks

Thomas

PS.: Have a nice Easter Weekend.