Issue 16b tilt/pan #6 - running EFX + LTP

[GGGss]

Another one is regarding the 16b processing of the engine.

When an EFX is running (in relative mode) and you call a scene on top of that - the engine resets LSB values to zero.

Steps to reproduce:
* go into produce,
* open DMX monitor
* play around with pos 1, 2 and pos-preset
* enabled 'New EFX 8' - you'll notice issue #5 it resets the LSB of the pan channel -> see the other thread
Now,
+ New EFX 8 is running
* Select Pos 1
- the engine sees the change in the LSB values for pan and tilt, but the EFX engine (?) resets them both to zero and there is no more fluent movements in respect to the LSB values.

https://youtu.be/4WE_ETzXrlM