Downloading firmware (c=1145 for example) does not affect the sample library (L=008) and vice versa.
These are two different digital files within the YRG.
Sample #16 is actually two different sounds mapped as a 'split' on the fretboard.
The metal sample plays on strings 6 and 5 (all frets), string 4 (to fret 13) and string 3 (to fret #8).
The muted sample plays on string 1 and 2 (all frets), string 3 (fret 9 and up) and string 4 (fret 14 and up).
There is no 'latency' so to speak from the performance of the YRG, however, the lowest muted sample on string 2 is heavily stretched downwards so the lowest frets and open string have a longer attack before the true pitch is heard.
i have the same problem too and it is only in that Nr 16 sample i got my YRG 2 weeks ago updatet it to 1.145 but that lag still exists;
it s a mess cause just that sound is great but i cant handle it that way and its in any preset that uses the nr 16 guitar sound