Radio/Chime/Onstar volume issue?

[HumbleAg]

Due to a defective battery and my old radio's desire to eat my CD's, my dealer just replaced the unit.

Now the chime volume and initial onstar volume are deafening. I tried adjusting the chime volume (hold down button 6 with radio off), but that just made it louder.

I also think the gain on the radio must be too high, I have to turn the bass down to about -2 to keep it from distorting. I can't turn the radio up beyond the second group of LEDs (about 8 steps up) without it sounding horrible.

Anybody else dealt with an issue like this? Anyone know if there is a gain adjustment for the radio output?

Thanks!