Hello Possemo!
I just figured it out (well, with some help from you and another program).
First of all, the FixedSlider is the perfect tool for that, thank you very much for the hint.
One question: Do you possess a Morpheus?
Here comes the explanation:
For negative values there is an offset of 16384.
Example: Pan PRIMARY VOICE (range from -7 to +7)
formula: F0 18 0C 01 03 54 41 LS MS F7 (from manual)
Turns out, that the MSB starts with negative values at 7E and will be wrapped to 00, once it arrives at full MSB. I just had to multiply 7E as MSB, then adding 120 (= -7 in Panning), and so on.
-7=16377 = LSB 121, MSB 7E
-6=16378 = LSB 122, MSB 7E
-5=16379 = LSB 123, MSB 7E
etc.
0=0 = LSB 00, MSB 00
1=1 = LSB 01, MSB 01 etc.
Thanks a lot for your help. I really appreciate it.
All the best.
Roger