Deliberately WITHOUT hpf/lpf: the channel's high- and low-cut are the two dedicated
PassFilters (EqState.hpf / EqState.lpf), a fixed pair with a
Butterworth SLOPE rather than a Q, and no lifecycle — a channel cannot be without them. A band
of the same name would be a second address reaching the same cascade for the same fact, which
is the one thing an entity map exists to prevent.
What SHAPE a parametric band takes.
Deliberately WITHOUT
hpf/lpf: the channel's high- and low-cut are the two dedicated PassFilters (EqState.hpf / EqState.lpf), a fixed pair with a Butterworth SLOPE rather than a Q, and no lifecycle — a channel cannot be without them. A band of the same name would be a second address reaching the same cascade for the same fact, which is the one thing an entity map exists to prevent.