It would be cool if a the advanced filtering menu had an option where, any time a filter lets an item pass through, it emits a redstone pulse.

If longer than a pulse is desired, it would be cool if placing a comparator in front of a filter would cause the comparator to receive a high signal, which would decay over time (the decay rate could be set in the advanced filtering menu).

Use Case

Place a redstone lamp next to a filter. Any time an item goes through that filter, the lamp will flash- giving a visual indication that the farm is producing that item.

Using the comparator instead, would provide a visual indication of what has been received recently instead of what has been received now.