can't hit legacy notes

[V-Ormix]

I had discovered this some time back and thought "aw that sucks" but maybe I'm doing some thing wrong - at the same time I thought maybe I should ask some one about this... but just forgot about it.

Now having had a random urge to wanna play legacy this christmas I thought now is as good a time as any to ask the fine people of these forums: why doesn't FFR's legacy engine register notes?

I set my scroll speed to what it use to be on legacy (1.87) and use the same remap for the keys (sdkl) and all I get attempting any song is booing out. So from this I know that I can at least send an input to the game but it puzzles me no secret genre pun intended why I can't actually hit any of the notes even with various combinations of the same mapping.