Midi Show Control to QLab 4 - more than just GO

the beauty of MSC is that you don't need to write additional commands than what you do anyway. if Stop/Back doesn't work, you could look into using GotoCue, that should synchronize both devices. GotoCue Last Enter will go back one cue.

It does, but it doesn't stop the current cue playing. That's the thing with QLab, it doesn't work like a lighting desk. Say I have a cue 5, and cue 6 fades it out and plays something else. If I GOToCue 5, it will play cue 5 AND 6 at the same time, since there is no part of Q5 which fades Q6.

Try this option:

QLab really doesn't behave much like any lighting consoles, many things you take for granted simply don't exist.

QLab doesn't actually support the concept of "pause" or "go back" - once a action has happened, it cannot un-happen.
You can only play another cue to cause a new action (or actions) to happen.

"Stop All" is an extremely dangerous action in QLab.
I never use it because it will immediately cause silence and black projection - usually far worse.

If you have important QLab cues that are likely to get triggered too early then you'll need to write 'emergency back-out' QLab cues to put it back into the right state.