Decoding FM subcarrier SCA with GNURadio

In Boston, some of the SCA on-air are in the table below (Jan 2016).

You can listen to SCA broadcast along with the 87-108MHz FM band with the WBFM_SCA.grc along with numerous other GNU Radio examples

GNURadio WBFM SCA block diagram
GNU Radio WBFM SCA block diagram.
RF Freq. (MHz) SCA Freq. (kHz) Content
90.9 67 Tonal Asian spoken + music
92.9 67 carrier only
104.1 67 Spanish catholic
104.1 91 carrier