The reason why FM/PM synthesis has this nice melodic property and not RM synthesis is due to the fact that in FM/PM, the modulating oscillator is typically a harmonic multiple of the carrier oscillator. This means that the resulting sidebands are also harmonic multiples of the carrier frequency, which are in tune with the original frequencies and are part of the same harmonic series. This results in a more musically pleasing sound that tracks nicely across the keyboard.

In contrast, in RM synthesis, the two original frequencies are simply added and subtracted, which can result in sidebands that are not harmonically related to the original frequencies. This can result in frequencies that are out of tune with the original sound and not part of the same harmonic series. Furthermore, because the sidebands are not necessarily harmonic multiples of the original frequencies, they may not track musically across the keyboard in the same way as the original frequencies.

Therefore, while RM synthesis can produce interesting and unique sounds, it may not always be suitable for creating melodic or harmonically pleasing sounds.
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