Alright, reset. Fresh start.

I know that I've taken up heaps of Calamity's time with my exploration of Loewe and Grundig SCART televisions. I've learned a lot and had a lot of fun and now have a great collection of interesting TVs. However, what I would like to do is go back to the beginning, armed with the knowledge I now have. I know there's still lots for me to learn but I believe I've at least worked out what hardware has potential to work well with GroovyMAME and also what doesn't. With this in mind, I'd like to put aside the digital chassis TVs for a while and concentrate on a SCART TV with analog image controls. My suspicion is that this process will be far more straight forward and more inline with the setup procedures for a real arcade monitor. We'll see if that eventuates but I reckon I might be right.
Here goes:
Model: Blaupunkt IS 70-33 VTN
Chassis: 310.32 (identical to Grundig CUC 5360 and Siemens 9106)
Chassis controls:Line width (R412 = 1k)
Horizontal frequency (R506 = 4k7)
Horizontal linearity (? - can't locate)
Horizontal picture position (R558 = 470R)
East-West amplitude (R422 = 100k)
East-West symmetry (? - can't locate)
Frame amplitude (R561 = 100 ohm)
Vertical frequency (R516 = 680k)
Vertical linearity (R549 = 10k)
Vertical picture position (R431 = 2k2)
Focus control (neck board)
Trapezium (R441 = 220k)
Note: the labels are those used in the service notes.
- - - - -As a quick test I ran vmaker with the default settings and started GroovyMAME with the "CGA" monitor type. Next, I started up R-Type and adjusted the trimpots. The image looked great and I was able to get the geometry and size really good. After admiring the smooth GroovyMAME scrolling for a while I then sparked up Street Fighter 2. After adjusting ONLY height everything was basically perfect! Well centered (horizontal and vertical) and no defects in the image shape!

WOW!
After all the discussion I've had here in the past regarding the more modern TVs, I can conclude that the digital chassis I've tried simply won't work in this way. This business of spinning one trimpot (vertical size) is SO much faster (and delivers better results) than adjusting the V-Size on, e.g. a Loewe. On the digital chassis, other things inevitably change e.g. image shape, width, etc. as the vertical size changes.
Now I know why Calamity has sometimes been a little surprised at some of the things I've reported!

Analog acts VERY differently. Better, overall.
Anyway, what I'd like to do is walk through the process of setting up GroovyMAME for this particular TV. I'm gonna focus on this TV until the setup is as good as it can possibly get. No distractions.
So, the TV has all those controls, my computer is setup ready to go (still using the ATI X300). Calamity, if you have the patience, it'd be great if you can walk me through this knowing that this TV probably isn't going to throw the same curve balls as the units we've worked on in the past. Assuming it's going to act more like a regular arcade monitor, what's the
very first step to create fine tuned monitor spec? (As always with me, priority is being able jump between CPS and M72 games and have everything look good.) If we can go step-by-step, I'll then edit this thread down so I can re-post on my blog (and other places) as a guide for others to follow.
Also, my big idea is that, if this works out, I could modify the TV to have a larger pot mounted on the front of the casing to adjust V-size (assuming it's feasible to patch a pot to the chassis). I reckon then I'd be pretty much set!

(I've included some pics of the hardware so you can get a feel for what I'm working with).