I have an MPX generator, Stereo Tool (
http://www.stereotool.com/) that records a 192khz wav. In it, is mono, pilot, Stereo, and RDS. The only thing missing an an FM modulator. Trying the Frequency Modulator and WBFM Transmit, I have had zero luck re-producing the original signal on any FM reciever. The audio is slow, too fast, the pilot (or RDS hash, not sure which) is clearly audisble and it looks horribly malformed in the FFT.
So....