| Talk with the manager, not just you but a number of the people in your team together. While usually taking a managerial start in solving problems with coworkers, you guys have already tried it and he ignores it... so it would be probably most efficient at this point to ask your manager(s) to take an action plan for this.
Afaik OS X does not able settings for disabling all sounds for the users...
__________________ MacBook Pro + Mac mini | Newton 2000 | @Work : Dell D620 & 2x20" + a lot of Macs | Workstation, VC & Fusion
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