While searching for an answer on this, I have learned that the EVO has the same problem as the Incredible. I just got my Froyo update today. When you press the button on your headset (or speakerphone) to initiate a bluetooth call, the prompt volume is very low and almost inaudible. If you are quick, you can increase the volume easily by hitting the volume control. However, the next time you use this feature, the volume reverts to almost inaudible. I didn't see any workarounds from the EVO answers, and wonder if anyone has found one for the Incredible, or are we going to have to wait for 2.3?