Digging thru the registry I found something that was overlooked before, thanks to the new USC 6.5 rom, it stuck out like a sore thumb!!
Here is a cab that will give you the option to turn "Be Polite" on and off in the sounds settings from the manila tab.
Tested and working on MightyRom, Stock USC Rom, and Juicy Rom.
Should work for all Manila 2.1 Roms. -- Will NOT work on Stock Sprint.
Give it a shot. Be sure to soft-reset after install.
Give it a shot and let me know your results!
Thanks
.