USF is the sound format that is sounds from a Nintendo 64, and this area is related to 64th Note - A
plugin for Winamp 2.x/5.x to play these N64 music

How it works is very simple.
A USF file is just a cut-down version of a N64 rom with a savestate, and this is loaded by the plugin, 
which 64th Note is a Music Player created from Project 64

I am working on my own player called M64, which if it works that'll be cool

More info on this to come soon  

JT   - Josh W

 

USF Links

USF Home: Halleys Comet Software

Download: USF Downloads and USF Sets and Zophar's Domain

Download: 64th Note v0.08

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