I bought a set of these recently for a very low price.

The set consists of one sound activated master and 4 slaves, each connected to the master by a 3 pin XLR cable.

I'm missing the standby/blackout controller which is connected to the master by a 3 hole female XLR.

Despite the fact that the set is shown as available on the Electrovision site, I have been told it is discontinued and spares are not available.

I'm guessing that a simple push to make/push to break switch would do the job but I'm not sure how to wire it.

Does anyone have the answer please?