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If the baclkight is connected through the regulated +5V and not directly to the battery (i.e. the usual points where the power LED was) you're putting a bigger load on the regulator. This may be contributing as well, maybe also depending on how good shape the electrolytic cap on that thing is.

If the noise is constant when adjusting the volume pot even on the prosound then we're talking interference from the power regulator board or maybe the CPU. A prosound with the volume turned all the way down is basically the same as shorting the mixer input to ground. The noise must be picked up along the stretch of wire inside the Gameboy.

Thinking about it, the lack of noise right after the loading screen suggests that this has to do with what is displayed on the screen. I can make you a test ROM to test this hypothesis. Also, before I do that, try and see if the noise goes away or gets lower if you adjust the contrast to the extreme positions, so the image gets completely white or completely dark.
(Btw, just because the problem might be in the display, doesn't mean that's the actual source of the interference. Varying power load from the CPU and display will change the operating frequency of the power regulator and can cause interference.)

But ultimately, I think this boils down to an interference problem. You have either
1) connected the ground cable to a bad ground point. As any good electrical engineer will tell you, not all ground points are equal. A ground lead, like any other electrical lead, will vary in potential (voltage level) between different points when there goes a current through it. The ground point on the pot is a good point. The negative battery terminal is probably a decent choice. The ground point on the 4-wire connection coming from the regulator board is a bad choice. If you've tried a point on the 4-wire and have gotten the wrong one so you're using e.g. the -18V point instead of ground, you're certainly in for a noise problem. You'd still get sound, but also a louder click on startup, as well as a lot of noise.
2) laid down the actual cables near things that cause interference, mainly the power regulator board. Maybe you placed the PS jack on the left side on the noisy one, and right to the side of the regular jack on the one that's not noisy?

Oh sorry, I didn't realize it was the last thing you posted.

Send it to me immediately. If it happened to the file while it was open, and not while you were loading a file, don't open/reopen any file over it. (Or you'll lose any changes you made to the open file.)

Ah! It's always been like that. I did it that way because that's the easiest way to not mess up ASCII art. I guess I should fix it. Thanks.

I remember there was one with a slideshow with light nudityl but I can't find it. There's Hot Gameboy by icebird but no mirrors are to be found for that. There's a short cartoon ass segment in Oh! by snotscrotum. Some elven tits from the side about 20 s into 20y by the same guy. Then there's of course always the joke demo Saulin penis, literally Sauli's penis, which also shows Sauli's butt. And that's all I think.

Yamaha was special in that it was a musical instrument company selling sound chips to game companies, not the other way around. Commodore/MOS Technology originally tried to sell SID to 3rd parties, if I recall the details from the book On The Edge... correctly. As history tells, they were not successful in doing that, but maybe there's some obscure product from the '80s for which there is/was only a few prototypes.