I recorded "Naked Science" episodes since about 15 days back and am observing MORE AUDIO issues YET AGAIN on Nat Geo HD! Center channel has very low volume when REAL 5.1 content is played. They have deployed the PSEUDO 5.1 converter for sounds recorded in 2.0 only! It kicks in on and off whenever it detects stereo recordings on the original 5.1 sound from Nat Geo HD!
Also, I noticed today AVL and mild DRC kicks both in Real 5.1 and 2.0 content. There are varies programs like Naked Science which have some 2.0 only footage, so during those footage, RANDOMLY this processing kicks in and is VERY MUCH AUDIBLE when it happens and destroys the original Stereo sound from the channel.
This CONFIRMS my SPECULATION on their strategy of deploying these converters/compressors on ALL HD channels and Star HD channels may also get them deployed soon if we don't complain!!! Currently its affected only on Discovery HD, Ten Cricket HD and RANDOMLY on Nat Geo HD.
I would encourage us all to TWEET TS @Tatasky and complain to them on all these audio processors they have deployed on SD and HD channels which are essentially killing the original HiFi sound INTENTIONALLY by them!!!