Where has my Push to Talk Indication Sound Gone?

I installed windows 7 yesterday after using vista. When I was using TS3 on vista, I always had a sound play when I pushed down my PTT (push to talk) button. Now that I have installed TS3 on Windows 7, its disappeared and cannot find a setting to enable it.
How do I enable the little beep or what ever sound when using push to talk?
Where has it gone?