Exec not functioning

Hi, I'm trying to utilize EXEC to have some text from a db query converted to a wav file using 'espeak'. The 'espeak' command works admirably by cli, but no matter what I do, exec does not seem to function on my Linux box, even though safe_mode is off. I've stripped the db query out, and ran a simplified text, 'Hallo Toofie' in the code. First off, I made sure that the espeak code worked by cli. It does. The code: <?php $command = "/usr/bin/espeak -g0 -ven+m3 -p22 -s170 'Hallo Toofie' -w aba.wav"; exec($command); ?> I've tried every combination I can think of including using 'espeak' without '/usr/bin', directing wav output to '-f /home/kronos/aba.wav'. What am I doing wrong? Any help, pointers, suggestions appreciated! -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/