I can report a couple of issues with this tool. The first one (which is pretty major) is that it inserts the cry unaligned. This means it won't play in the rom!
You need to make sure that the cry is word aligned (ends with a 0, 4, 8 or C) or the rom can't play it!
Secondly, and less importantly, it would be nice if we could set where we want the search for free space to start. Unless I missed that in the INI of course...
These issues aside, this is a great little tool, and the quality of the cries is a vast improvement over PokeCry's GUI.
Also: The tool has a bad habit of inserting new cries over the "quiet" sections of old cries. In older cries which the tool has inserted, if there is a certain amount of FF's back to back, the tool inserts the new cry over the old cry, causing problems.