In one implementation, a method for implementing gain control enhancement for modulated communications includes establishing a communication session between a first endpoint and a second endpoint. Cell capacity is increased by using two antennas for each sector corresponding to two subsectors with each using a subset of the CDMA codes defined for the sector and with each subset including a pilot channel. The adder is configured to sum the samples with corresponding unsuppressed samples representing analog signals received from the ion detector during previous mass scans, the summed samples defining a mass spectrum. Therefore, the wear layer exhibits significant clarity and visual depth, as well as improved maintenance properties. The preferred method embodiment includes contacting the customer prior to the decision point to promote trade-in of the vehicle and a new vehicle purchase.