I need to hear this explained,on my Ion,the radio has pre-selected sound
variations,rock,c&w,classic,custom,etc,are these types the electronics
manufacturers just "put on?".There is some sound difference,but the only
things you can adjust,yourself,are treble & bass.And why does my radio keep
skippng bass & going to treble?,have to keep pecking that knob. Thanks.

those are equlizer presets set by the factory. I agree, not alot of audible
difference, but you can hear the difference between say, News, Jazz and
Country EQ settings.

Check out your owners manual for exactly how to operate your EQ settings,
you shouldnt need to "peck" at it. You should be able to select and toggle
through all settings one by one. It may difer between which factory audio
system you have.

marx404