Function isBandOrigin

isBandOrigin(
tag: string | undefined,
): tag is "fbs-fixed" | "fbs-live" | "hrp" | "room-mode"
Narrow an arbitrary tag to a known BandOrigin. Exact membership, never a prefix.
Parameters
- tag: string | undefined
Returns tag is "fbs-fixed" | "fbs-live" | "hrp" | "room-mode"