Sound Sculptor II is RAM based, but the Undo and Clipboard files are disk based (when the Clipboard is not visible).  If you are getting memory warnings or would like to increase recording time, give it more memory in the Finder with "Get Info".

When memory is running low, a low memory warning message will be displayed, and all the menus except Close and Quit will be disabled.  The menus will not be enabled until some windows have been closed to free up some memory.

If a get resource failed warning message is ever displayed, most likely it's because there is not enough memory to load the resource when trying to display a dialog box, try closing some windows to free up some memory.