On i386, it doesn't segfault if using the -Write_Phonemes option or the undocumented -Write_Klatt option, but does segfault when using -Write_Ulaw, so the error looks to be in the conversion from the klatt representation to ulaw.
-- Neil Muller -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]