Bingo! Sudden realisation!!!
V4 MKS-70 has, I *think*, all MIDI Controller number allocations for editing – not sysex. With that in mind I tried the simple host in/host out option with the V4 panel, just to test (I’m hoping the new synth will be here in a couple of weeks) and… it works! Well, at least I can see that the controller data is making it to the MIDI port.
The panel I’ve been testing with (MKS-80, because I have a couple of those) is generating sysex, and it was this that was being blocked by Cubase.
Phew! Looks like I have a solution. Many, many thanks to all here who have given their help. I do appreciate it. Hopefully I can come back to this thread and report that all is fine once the synth lands with me – it actually did land once, but the PWM mod was futzed, but that’s another story…
An Eagle for an Emperor, A Kestrel for a Knave.