Is this game in surround sound?

I loaded up this game and my my decoder does not decode the game in either Dolby Digital or DTS. I figured it must be running on Dolby Pro Logic II so when I turned it on I did get some surround effects but they were pretty weak. Can anybody confirm the audio format this game is running on? Thanks.

P/s. I know it's an old game but the original RE4 did run on DPLII and I'd expect it to be DTS on the HD version at least. Hey, MGS HD Collection did that to amazing results why not this?
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