what do you mean, of course it's inacurrate because it's not spot on the beat. i also tested one that has 20% gap and it's still not very noticable to me. Even though there are players that more sensitive, i want them to know that they're not hitting the note accurate enough if they didn't experience the volume change.
Hitting a little early does not make the hit not accurate. That's why I don't agree with your reason.
But fair, 20% difference seems not that a huge deal maybe for you. Though you can still consider add green line 1/8 early with 10% difference makes your intented action still in effect while still prevent low feedback.
How does only moving or adding green line makes things complicated, it is in the end to improve gameplay. Volume does directly affect gameplay so of course I will be persistent with it. You can revert it back since I don't really care with it anymore. 20% gap is still in borderline that I can consider acceptable.
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