^
Ooh. Interesting.
But, may I suggest, not as strong a test as one where you actually do hear a zero-latency instrument playing? - I say that because (conceivably?) you might have been lured, by previous experience, into the habit of playing a little early against the click. If you did actually hear a zero-latency instrument sounding, I imagine there’d be more pressure to press the keys right on the click(?).