My car radio has 4 wavebands: AM, FM1, FM2, and FMast.
I know what the first 3 are, but FMast (no explanation in the manual)?
All 3 FM bands cover the same range of frequencies.
Could it be some device for suppressing the stereo signal component to produce mono, to reduce noise in poor reception areas?
Anyone know?

DVD+ vs DVD-???? Uhmmmm...
