Split mode not working properly for FX

[DrJustice]

...
If PB mix all voices down to a stereo mix and then enter digital domain audiowise still no problem.

Yes that's what the PB does, and therefor all voices will always have the same FX applied.

Nothing extra is needed hardware wise.

If the different voices were to have different FX settings when played at the same time, which was jhlz issue, then quite a bit of additional hardware would be needed to process each voice separately.

[jhlz]

So by design it is not possible to stop A from sending to FX while B is playing?

What about key tracking would that work somehow?

[DrJustice]

So by design it is not possible to stop A from sending to FX while B is playing?

No it's not. What you can do is playing the lower and upper at different times, using something like the mod env method to get FX or not. If you play both, the last action to control the FX will take effect, and both A and B will be effected equally.   

What about key tracking would that work somehow?

Same thing there. It's the one mix down of all six voices going to the one global FX unit.