Boe let me know about a thread on CrackBerry forums with a link to OS 188.8.131.52 for the 8330 CDMA Curve. This is not a beta but rather a pre-release according to the poster CodyBB so take care when installing it. According to Boe this update fixes the speaker blast that has been plaguing OS 4.5 devices.
Kudos to those that found it including PedrotheGoat, Sling, bdizzle1982 and follow the thread on CrackBerry Forums for more info.
Let us know what you find in the new OS versions in the comments below. Keep the tips coming!
NOTE: Do not install this software if you do not know what you are doing. It may make your BlackBerry FUBAR or just plain angry.