It all depends on the power of the system you're running it on. If your PC (or whatever) is good enough to run most/all games with audio latency of 1, without it causing a slowdown, then stick with that. Slower machines will probably need a higher latency setting, to avoid slowdown. That's what the audio latency setting is for.
I tried it set to 0 out of interest, but couldn't tell a difference from a setting of 1. The source code probably just clamps any setting given to the range 1 to 5.
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