Is it possible to reduce the volume of the Amplified Chargers for the Minitor III's when in the charger and alerting. When alerting they go to full volume which is enough to drown out a lawnmower. Because of this many of us cannot keep them on at night because the rest of the house is awakened. Perhaps a cap or resistor across the speaker lugs in the charging unit ? [yes, both the pager and amp unit's volume are turned low-as-they-go)