Turning off the "tap" sound?

[Dirk Bergstrom]

Back in June there was a thread about turning off the tap/click feedback 
when you touch the screen.  Towards the end Michael 'Mickey' Lauer wrote:

 > *) I still like my tap sound.
 > *) Almost all people do not want the tap sound.
 > *) You will be able to turn off the tap ;)

However, I haven't been able to find any instructions on how to 
accomplish this.  Is there a way?  The tap noise drives me crazy.  If I 
can't turn it off, can I at least put a different sound in there, 
something much quieter?

--
Dirk