Galaxy Radios DX-949 40-Channels Base CB Radio "range power clarity" Questions

...Range, VR 5.....FM Deviation, VR 8....RF Meter, VR12...Low Power AM Modulation, VR13...AM/FM High Power, VR14...High Power AM Modulation, VR16...AM/FM Low Power. Unmarked VR in R188..AM/FM Medium ...