Can you clarify if you are using the WXM or MXM to control your MPs in Neptune?
I’m fairly certain they still haven’t added support for sync/anti-sync for MPs yet. A few of the AI models received sync/anti-sync support.
I’ve had the same issues as OP. A3 Pro, MXM, 3x MP10wQD. All items are up to date in Apex and Mobius.
I tried having my right as the primary and put my left one in anti-sync with 100%.
The MP10 L controller remained in its previous mode. So I turned it off via Apex. It went into its grey/white mode. I turned it back to auto so it would go into anti sync mode. It isn’t switching to anti-sync (orange). It remains grey as if the MXM cannot communicate with it.
So this confirms that as of 7/10/2024, MP wave makers still lack sync/anti-sync modes (yet alone back mode).