Masking signals from circuit network

[mergele]

So I've got a pretty cool automatic resupply system going. There is only one thing missing to make it perfect (for now), and I just can't figure it.
I have a memory cell which is storing unknown singnals with unknown values, and I want to be able to set a constant combinator to mask out signals from it. So for example the memory get's 50 belt and 30 ammo as input, the constant combinator is outputting a belt signal, and as a result the belt signal get's deleted and the memory cell is outputting only the 30 ammo signal. This is not time critical, if the memory is outputting a signal that should be deleted for a few cycles that is fine.
I hope someone can help me.

[DaveMcW]

The simplest way is to set "belt = -100" in the constant combinator, and "EACH > 0" in the memory cell.

[mergele]

Face, meet desk - moment of the highest order.
I don't need to perfectly eliminate it, I can just run a -10000 or so in and then add a filter. God I feel so stupid right now.