When I find customs, I almost always go see if there is a video preview so I know what I'm getting into before downloading. That's why I am offering myself to make chart previews to anyone. If you would like one done, please contact me through direct messages (whether it's for one song or ten, I will still do them).
I use Dolphin Emulator, autoplay, and custom HD textures to try and make them look as good as possible.
Here is a link to my preview channel if you want to see the quality of the previews (you may also see them on some customs on the forums that link to my videos)
(Forgive me if this isn't the right place on the forums but I didn't know what other place to post this)
EDIT: You may also message me through my discord, Pizzachamp#2157