Working with a 16-bit parameter, and unpacking multiple parameters, etc in SysEx using MDP2

Question

MIDI Target Manufacturer(s): Yamaha

I'm having a rough time controlling only a few aspects of my Yamaha Motif ES workstation. I think MDP2 can do this. The issues are mutually exclusive, yet both revolve around multi-bit sysex parameters MASTER TUNE, and INDIVIDUAL OUTPUT GAIN. 

MASTER TUNE is a 16-bit parameter, which Yamaha splits the bytes into 4-4-4-4 to get 16. 

The other, INDIV OUTPUT GAIN requires the slider in MDP2 to know about the other parameter values. To change the value pair for output 3&4 the parameter has to know 1&2, 5&6, 7&8 too in order to incorporate it into the sysex message.

MASTER TUNE
F0 43 10 7F 00 00 00 02 then what?? 7F
-102.4 – +102.3 [cent] 
1st bit3-0 → bit15-12 
2nd bit3-0 → bit11-8 
3rd bit3-0 → bit7-4 
4th bit3-0 → bit3-0
-------

INDIVIDUAL OUTPUT GAIN
F0 43 10 7F 00 00 00 10 then what?? 7F
bit0: 0/+6dB 1 & 2
bit1: 0/+6dB 3 & 4
bit2: 0/+6dB 5 & 6
bit3: 0/+6dB 7 & 8
bit4: 0/+6dB 9 & 10
bit5: 0/+6dB 11 & 12
bit6: 0/+6dB 13 & 14

The originally-formatted data sheet is attached below.

I have two scenarios that I was initially working on in Logic Pro, but it's too limited. The forum post and discussion is here (will open in a new window) if anyone wants context to what I'm asking AND some rather informed answers. I paraphrased the discussion prior to the link I posted. Any advice is appreciated. I'd like to understand how to deal with this in MDP2 but I don't even have a starting point right now.

Images

Yamaha MotifES sysex parameter change table

Comments

Roland also spreads 16 bits across four MIDI bytes.
Named ticks can implement this.
Need to build the values in a spreadsheet.
Column for each of the individual byte values, multiply each by 128^(the byte position) (* 128^3, ^2, ^1, ^0) then sum
Set up the SysEx control with a four byte V
Combined value gets loaded in the SysEx control named ticks.
There is a three byte example in the master class.

---

One more thought, this is 2048 steps, which can be a challenge in a MDP2 control.  What I have done in many cases is keep the fine steps around zero, then further away increase the step size.

---

Thanks for all your help and wisdom on these issues. I'm going to try to flesh out your initial explanation. Now off to *try* to remember how to do 3rd order polynomial curve fitting in Apple Numbers. . .