 Some stations choose a mixture of DCC and AMC which uses a complex carrier vs. modulation curve, typically running less carrier for modulation in the 25% to 75% range, and with more carrier during peaks and pauses.DCC can work with frequency modulation (FM), but was never adopted for high-power FM stereo transmission.The main reason for using either MDCL method (or the combination of the two) is to save power and money.