Hellborg:
- Wal double neck, and a fretted one
- 27 fret bass (Italian Reccanati?)
- Status (36 V circuitry)
- Wechter
- Warwick
- amps and cabs like TE, EBS, Warwick...
He's obviously been searching for the perfect sound.
Stan the Man (Alembic, Löwenherz, EBS, Carl Thompson...), Jeff Berlin (Markbass, Cort...), Les Claypool (Carl Thompson, A/DA...), Phil Lesh (Modulus Graphite, Ritter...), Stuart Hamm (Kubicki, Fender...), and the list goes on.
Certainly not least: Jonas Hellborg.
Status was not mentioned, although that name states "stable". I know they can only be found 2nd hand with some luck. But if you are after a Status, you sure want to invest to your bass, and not waste your money to Fender/Squier. Have you ever tried a Limelight?
This is an EMG magnetic viewing film that I found from some music shop maybe two, three decades ago. I do not know whether they still sell it. Green thin film filled with oil and iron particles. You can buy similar stuff here:
https://e-magnetsuk.com/product-category/magnetic-measurement-tools/magnetic-viewing-film/?srsltid=AfmBOorfmS1KTjOfyFqR4muH4SaqQq50KoIPhFn1zOUjMcd29qqtPwtH
Not specific. Usually those models mentioned have a thick sound, if not heavy bodies, too. If a suitable instrument happens to pass by, I might be tempted. But has to be with a dark fretboard.
I am actually amazed, how cheap most of them sell, as they are real workhorses. Probably you could use one as a shovel in the garden, and play a gig in the evening after wiping soil off of it.
My feel has been that single coils tend to sound somewhat compressed, no matter split duals or true singles. But that's probably because of my instruments, amps, and playing style.
Maybe the band has decided to play the song half a step lower, and the previous bassist has had issues with transposing. He has just lowered the tuning, and still could have used the common positions on the fretboard. To me this looks like a lazy way to transpose.
One big issue I learned from my then colleagues:
Pineapple is just one system that is updated every now and then.
Robot is a family of operating systems, because manufacturers can and do tweak it for their own HW and UI. This has led to several funny (or less funny) issues over the years. Sunny has a lot different OS than Singsung than Two- than many others.
Banana is much more expensive (one manufacturer) and its pure number breaking performance is quite lame compared to Aliens, but as the system is just one, it has won many users, and coders (which means applications including HW).
With Papaya you most probably would have a working system. With the other, I wouldn't ever be so sure. And after any update anything can happen.
(I use both, because I have to use Fruit 12 Pro at work, and it is the worst phone I have ever had. One dealer started to laugh when he saw it, and asked have I managed to make any calls with it? Truth is: not many without WLAN. The same with email.)
You can buy magnets in many shapes. I mentioned this in my comment, maybe I was just unclear:
"The choice has to be made from material, size, shape, field intensity..." These are not automatically excluding each other out. Bars, rods and plates are very common. If you need a bigger amount, custom shapes are an option.
Martin Gaye - What's going on
Tammi Terrell and Marvin Gaye - Ain't no mountain high enough
Johnny Pate - Brother on the run
I have played these quite a lot, but making them fluent and stylish require even more playing.
@ChrisDev gave us an A. Holdsworth (Jimmy Johnson) score, that I want to learn. Can be found from the section Theory and Technique.