Wierd question about Transformers HD-DVD and missing sound effect

I cross posted this in the HTIB thread, but realized it would probably get more attention here.

Okay this may sound like a wierd question but I can't figure out why its happening.

Slight history. I have the HD-DVD version of Transformers. I remember, when seeing in the theater and when I watched the movie (played on Toshiba A2) connected to my HDTV via component video and 2 channel audio, utlizing just the TVs speakers (no surround) that you clearly here the trademark "Transformer Sound" when Optimus Prime first transforms for the hero and heroine. You hear again through out the movie when other bots transform. You know the three tone digital progression that you always heard in the cartoons.....vrr vrr vrr...or something.

Okay now the issue: I now have the HD-DVD player connect to the Onkyo HT-SR800 via optical and I chose a variey of listening modes but can not for the life of me hear that "Transformer Sound". I can't here it when the system plays 5.1, 6.1 or 7.1. Its just not there. As far as I can tell all other sounds/audio/dialog/effects are there.

Now its one thing if it was in the theaters but not on the DVD as it could have been a conversion issue, but I clearly heard it on my 2 channel television.

Any one have any idea why this might be happening or do you think I am just loosing my mind . I'm at a loss.

Thank you.

Yeah its strewn around a bunch. Not everytime, but sometimes its elongated and other its comes out quick.

I replay it tonight and see if I hear it at the beginning. Although I am 98% sure it is played when Optimus transforms.

Hmmmmm. Maybe that 2% uncertainty i rearing it ugly head. Thanks for the comments I'll check the helicopter scene tonight. Guess I was crazy. Thanks guys.

Thanks all for responding. Those that mentioned it happening during the helicopter scene were absolutely correct. I played it last night and hear it clear as day. I must have fixated on the trailer. Guess I am going a little crazy.

I can't remember hearing Starscream yelling at the end of the theatrical. And since I just finished my HT and Transformers is the best HD-DVD I have for testing out the rig I have been watching the beginning, the freeway scene and the end over and over again. Not many of the pictures in my house are straight anymore

Thanks again everyone.