I too had many problems getting music123 to work reliably on my machine. (It wasn't just -z flag, it crashed 99% of the time between songs regardless). I found that simply changing the build dependencies to gnat-3.4 and recompiling/building the package is enough to stop the seg faults on my amd64 machine.
Thanks, Andrew Ruder -- Andrew Ruder <[EMAIL PROTECTED]> http://www.aeruder.net -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]