I *think* that the loband is used for those MSP barracks that are on FiRST as a backup, if they can't reach FiRST for some reason. But if they're just patched, then that wouldn't necessarily apply.
Keep in mind that MSP is not at all chatty, unlike many metro related systems, like PG or AA county. Don't expect a whole lot of traffic; you simply won't get that much from them.
Mike