Purchased a Yamaha RX-V1400 a few weeks ago. It has DPL IIx....it's written on the box and on the receiver and I can get DPL IIx from 2 channel sources...i.e. TV.

Can you put this receiver in DPL IIx mode while playing a Dolby Digital 5.1 source? I've heard some say yes and others say no. If yes, how do you accomplish this? When I play a Dolby Digital 5.1 source and press the SAME button that gives DPL IIx all I get is Dolby Digital SUR Standard and Dolby Digital SUR Enhanced.