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loopy made this a while ago for us at NESdev to render audio out of a PowerPak so that it had less PPU noise. Press "Start" to turn the PPU off when playing an NSF.
Put this in your PowerPak directory.
[url=http://www.qis.net/~b00daw/ppuoff.mp3]Here is a blank NSF playing. At around 4 seconds the PPU is turned off. It's not entirely quiet, but more quiet.