Garmin Beechcraft 200 Series Cockpit Reference Manual page 66

additional Features
3) Press any one of the (PS1 - PS15) softkeys to assign a number to the
active channel.
4) Press the SET Softkey on the desired channel number to save the channel
as a preset.
adjusting volume
Radio volume is controlled at each passenger station.
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Garmin G1000 Cockpit Reference Guide for the Beechcraft 200/B200 Series
190-00929-00 Rev. A