WC will not sync. It might sync up for a small amount of time, but eventually it will fall out of sync. Everything on WCX network runs off of a synced internal clock. WC does not work that way. If you want true sync with your bar, the easiest way is swapping to WCX IO board. The cheapest way is with a WCX expansion module. But that is a ton of work, due to the Legacy modules being ground switched. Im sure that you know this. But yes, just confirming that your WC Legacy will not sync with anything.