Higan is complicated. However, when properly configured, it can be great. here's how to do that.
First off, click "settings"->"video emulation" and disable everything, then go to "video shader" and select "none".
Now go to "advanced" and make sure to select the drivers "video
Now restart higan. If higan trows an error message, change the audio driver to "Xaudio2".
Now go to the audio section and change the latency. By defalt, it's 20, and normally that's the lowest it can get, but the "WASAPI" audio driver allows 0 latency
Now go to the video section anc make sure vertical overscan mask is at 8 and it's configurations are disabled, like this:
Now install these shaders: https://bin.smwcentral.net/u/38909/quark-shaders-master.zip
and extract them to where the higan executable is.
Make sure the folder is called "Video Shaders" like in the file or it won't work
Restaring higan, the shaders shoud appear in the "video shader" option(note: they only work on opengl). I recomend the "AANN" shader, as it allows the image to remain a sharp image when scaled to a non integer scale.
If you prefer not to use shaders, enable the "integral scaling" video option, like this:
After opening a game, a tab with the console name will appear, click it and change "controller port 1" to "gamepad".
Hope this tutorial was helpfull, as it was my first tutorial and my second post