I played the 3 midi files on my sc55 and they are pretty much the exact same tracks as regular Doom, just downmixed and with some instruments missing. So instead of converting you might as well just download better quality music from the original...
This was just recently added to 1.22.1, I think it warrants further testing.
How to activate, go to settings>user interface>3ds display mode>2d high resolution and I think bilinear filtering needs to be turned on for most cores (except the ones...
I was able to play all the way through Ninja Gaiden without issues.
Here are some games I tried out with bugs:
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Batman Returns has tearing while scrolling, and artifacts which seem related to vsync. In 0.1.2 there was still tearing but less...