Chaos 12mb Soundfont bank

Hi,
I'm trying out this Chaos Soundfont bank. All is well but for one
problem. The "distortion guitar" won't play correctly. There is a high
pitched beep shortly after the note is struck. Like the loop isn't
working on it. All other instruments seem fine.

I'd really like to sort this - perhaps in Vienna. It seems a nice
guitar sound but for the meantime I'm having to substitute another
soundfont for it which isn't quite as good.

Thanks for any advice
tomsun