> but most broadcasters choose to continue regular FM simulcast and subdivide the remaining digital bandwidth across multiple virtual channels. The FCC has not

> but most broadcasters choose to continue regular FM simulcast and subdivide the remaining digital bandwidth across multiple virtual channels. The FCC has not approved all-digital modes yet. Further, we cannot control the bitrate of the "main" digital simulcast. We _can_ control the sub-channels, but it doesn't matter how much bandwidth you throw at it, the HDC codec (which is a bastardized form of HE-AAC) always sounds like garbage. This is partially owing to the codec, but also to the fact that we only have 96kbit/s in total to allocate to all sub-channels.