In the Key edit area, with ACOUSTIC FEEDBACK ON, we used to HEAR the changes we made using the PITCH fonction in the Info Line. But there is no sound witn Windows 7.
Hope you put it back, should be easy to fix.
Confirmed (Mac OSX 10.8.2 here).
(still works from the up/down arrows though).
Interesting, confirmed W7 x64/C7 x64