Friend brought the BASIC PS2 game creation tool to attention:
https://game.watch.impress.co.jp/docs/20010123/artdink.htm
https://www.nicovideo.jp/watch/sm7259278
Manga:
https://archive.org/details/basic-studio-ps2-documentation_202510/Get%20started%20with%20EZ%20BASIC%20-%20ENG/page/11/mode/2up
The translator:
https://forums.insertcredit.com/t/welcome-to-basic-studio-powerful-game-workshop-ps2/5395

This thread is for documenting tech like this.

The manga reminded me of this mobile GPU one: https://armkeil.blob.core.windows.net/developer/Files/pdf/graphics-and-multimedia/how-does-a-mobile-gpu-work.pdf

I mentioned playing with VSTs in the Music thread, if you want to have a good time just playing with weird glitch effects, look at LORD Jack Dark's anime tit laden kino plugins.

https://archive.org/details/complete-jack-dark-plugins
I couldn't get anything musical out of these, but they all come with their own READMEs, some of these (Mr. Mutilator) feel more like straight up artfag pieces rather than actual music software.