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If there is a sequence of one or more writes that the Gameboy could do which would make this happen, then yes. But there probably isn't. Normally this is either controlled by hardware (by a a capacitor that is charged on the first turn on) or by the USB controller chip. There may be no way for the Gameboy CPU to trigger this condition.

The HP filter is needed for different reasons, namely to avoid DC offsets. The LP filter in this case should probably be an FFT of the waveform, and then an inverse FFT when generating the output wave, but leaving out frequency components above the Nyquist frequency. Or, something like minBLEP I suppose.

Just chuck whatever basic features you want in there, but there's something that's perhaps more difficult to code, but highly desirable, namely bandlimited waveforms. This means that the waveform won't alias at higher frequencies/for higher frequency components. (The latter is often the case with some wonky waveforms some people like to use in hand drawn waveforms.) Another thing to consider, even though I'm not sure how to best do this for a non-tracker interface VST host, is pitch type commands like 1/2/3/5 in ProTracker/Fast Tracker style trackers and L/P in LSDj.

Thread cleaned up a little. FFS...

I have alerted Johan about this.

The application is included in the zip, and the readme describes what you need to do.

http://www.dwedit.org/gba/goombacolor.php

However, you should not use Goomba together with the Bridge.

A few glitched logos, old and new.