Audigy 2 here and I think I know the noise you mean. I've only had it once in an unpatched version. If it is the same noise it is inherrited from SH3, yet you said you have no problems in SH3...
I'm pretty sure it had something to do with mine fields but as I haven't heard it since patch I can't remember, the last time I looked around on this problem was back in SH3 days....
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