I had bad sound crackling problems in frodo too, they're still there which is something I need to look at still but not as bad as they were. I found it happened most when I wanted to slow the emulation down and I used a small loop that sat doing nothing for a while. A quick fix I found was to have that loop read a video register instead of doing nothing.
It might be that this keeps the memory bus more busy, thus slowing it down and avoiding the bug.
It might be that this keeps the memory bus more busy, thus slowing it down and avoiding the bug.