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My DDR setup -- a Windows gaming PC connected to a pretty standard stereo receiver -- has 70ms total latency between button press and audio. That's more than enough to make the game unplayable, except that of course StepMania lets me configure it to pretend button presses occurred 70ms in the past.

It wouldn't surprise me in todays market but humans are much more sensitive to audio than visual. That's why in audio production ~10ms is the max tolerable limit IIRC.

Since most games don't even let you choose dedicated ASIO drivers for output, I'm not surprised at all. I think 50ms for gaming is okay.