Help with editing a soundfont

Hi,

I was hoping someone could help with this problem/point me in the right direction:

I found a jazz guitar soundfont I really like, but on sustained notes, clicking and other unwanted noises follow the original sound of the note. I've tried playing around with the soundfont's parameters in both polyphone and viena but I really have no idea what I'm doing or what to focus on.

I've attached a zip containing the soundfont itself, a simple ms4 file using the soundfont, an mp3 generated from ms4 (the noises are worst starting at the 4th note played), and a screenshot of the parameters in viena.

Maybe this is not a solvable issue but if anyone has some ideas for resolution (or even a workaround), I would greatly appreciate it.

Thanks!