thanks r32paulbut still cant get it to work
found this tho and will give it a try:
Speed-sensitive volume control setting
This feature allows you to increase or decrease the speed sensitive volume with the Business Radio as well as put your radio in different country modes (such as Europe mode). This doesn't work on all radio options, but give it a shot:
First, don't be driving while doing this procedure ! !
Turn the radio off then on again. Don't touch any button except the 'm' button - the button you use to tune the radio frequency manually.
Press and hold the 'm' button for TEN seconds or until the display changes. IIRC, it shows the serial number of the unit.
Normally when you press 'm', the display will reflect that by replacing 'ST' (stereo tuning) with 'm'.
When holding the 'm' button for this procedure, the display should not do this - you will continue to see 'ST' for the ten seconds.
Now if the display has changed, you are in a configure mode on the radio.
If you press the '+' or '-' button you change modes.
The mode you want will display as "GAL (1-6)".
This mode allows you to adjust the speed-sensitive volume control.
Use the radio preset buttons 1-6 to set the amount of volume change you want at speed.
Setting 1 is the Smallest change, 6 is the Largest – highest amount of change.
Stock setting from factory is "3"