First check it out with a pair of headphones right at your audio output jack in an effort to see if the program itself is doing this or perhaps a connection between Mac and amplifier has become a mono summing connection...

**As the beloved Mac platform morphs more and more into looking -- and acting -- like an Intel/Windows-based machine, I am finding for the first time ever that rebooting the Macintosh is in order when things go bump in the dark. Used to be able to leave the Macs running 24/7 forever without problems, not so much anymore, things get corrupted, bits get lost, etc. and sometimes the Reboot puts all the bit ducks back in a row behind the mama duck.


--Mac