Metrosonix FM SCA subcarrier receiver

The Metrosonix MS-Y2K1S is a small portable FM radio which can also receive 67 and 92 kHz subcarrier audio (SCA) channels. These are additional broadcasts which cannot be received on a standard FM radio. FM SCA is typically used for foreign language programming and reading service for the blind. SCA was also formerly used for Muzak-type background music services, but not anymore.