DN_GAIN_ADJUST
state->CH_Ctrl[4].Ctrl_Num = DN_GAIN_ADJUST ;
status += MXL_ControlWrite(fe, DN_GAIN_ADJUST, 1);
status += MXL_ControlWrite(fe, DN_GAIN_ADJUST, 1);
status += MXL_ControlWrite(fe, DN_GAIN_ADJUST, 2);
status += MXL_ControlWrite(fe, DN_GAIN_ADJUST, 2);
status += MXL_ControlWrite(fe, DN_GAIN_ADJUST, 3);
status += MXL_ControlWrite(fe, DN_GAIN_ADJUST, 3);
status += MXL_ControlWrite(fe, DN_GAIN_ADJUST, 3);