Do you mean the volume of the audio? You may have the modulation for the band of the hit set for FM when the hit is for a NFM signal. There is no 'correct setting' for this since different users use different modes, and no setting will be correct for everyone. But, if you find the audio low most of the time, try setting that band (or those bands) for NFM. That will make the audio level higher.
If you mean the alert tone, you may have it set for a low level. Set it for AUTO.