Always set to 0 unless you have an American TV. The 7.5IRE is the NTSC composite video standard and alters the settings in the video DAC to add the 7.5 IRE pedestal to output composite video correctly to those US sets that expect this.
In any case use Video Essentials or Avia to calibrate your set
John
Correct me if I am wrong, but does this mean if I use an NTSC disc on either my projector or Philips tv (which is for the British market,but accepts a NTSC signal), that I should use O IRE for both?
Please confirm.