NitroFont is a hobbyist, high-quality soundfont initially released on August 14, 2025, on the Polyphone website (https://www.polyphone.io/en). While it sounds mostly realistic, the goal when creating it wasn't to make it sound so—I just wanted it to sound good on my ears, by using some of my favorite samples. And, after several days of testing the soundfont, making adjustments, and trial-and-error, this is what was achieved.
I was trying to make a high-quality soundfont as far back as 2022 (unless I'm wrong). Back then, I didn't have as many soundfont creation skills as I have today, so the soundfont I made sounded not so good. I deleted it—for good. In fact, I made multiple attempts at creating a high-quality soundfont. Many of the end results were scrapped because I couldn't achieve what I wanted to. But eventually, I made another attempt, and got satisfied with the final result in the end.
Being a high-quality soundfont, it takes up more disk space than the soundfonts I made before it, at ~50 MB—and it's unsurprising. The soundfont takes advantage of some of my favorite samples, taken from a wide variety of sources such as FluidR3 and GeneralUser GS.
All samples were taken from other soundfonts I could reach on the Internet (particularly Polyphone and Musical Artifacts)—all of these are freely licensed AFAIK, so I had nothing to worry about. However, it's important to note that some free (as in "freedom") soundfonts have samples of dubious origin. So, if you notice a non-free sample in NitroFont, please let me know. I'll try to replace it as quickly as possible and do my best at preventing myself from getting into a legal situation.
Feel free to suggest additions or changes to the soundfont, or report an issue here. Requests and bug reports are appreciated!
NitroFont is available under the terms of the Creative Commons Attribution-ShareAlike 4.0 International license. See https://creativecommons.org/licenses/by-sa/4.0/ for more information.
