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Open Hidden Sound Channels in the NES - RetroFixes
http://www.retrofixes.com/2014/05/open-hidden-sound-channels-in-nes.html#:~:text=To%20get%20expansion%20audio%20activated%20you%20only%20need,range%20in%20the%20middle%20and%20test%20the%20sound.
NES Expanded Audio: 100k Pot Mod - The Curriculum Crasher
https://curriculumcrasher.com/2017/01/24/nes-expanded-audio-100k-pot-mod/
NES Expanded Audio: 100k Pot Mod By kevinrburke on January 24, 2017 Like many others, I modified my original NES with a 47k resistor to support expanded audio playback. While connecting expansion pins 3 and 9 does access the …
Everdrive N8 & Famicom Expansion Audio to NESRGB
http://www.firebrandx.com/edn8tonesrgb.html
Right, so getting on with it, lay the resistor across the expansion port audio pins on the top of the NES mainboard (this is the area underneath where the cart slot normally sits). Determine how long you need the legs of the resistor to be in order to reach and solder to pins 2 and 9.
Open Hidden Sound Channels in the NES - RetroFixes
http://www.retrofixes.com/2014/05/open-hidden-sound-channels-in-nes.html
To get expansion audio activated you only need to add a resistor inside your NES. Phillips Screwdriver Medium Sized Experimentation suggest using a resistor ranging from 24k up to 56k . Pick a range in the middle and test the sound. The sounds with PowerPaks, Everdrives vs Real Famicom carts can vary. Soldering Iron & Solder
Nerdly Pleasures: Famicom Expansion Audio Overview
https://nerdlypleasures.blogspot.com/2017/08/famicom-expansion-audio-overview.html
Instead, the NES sends its audio directly to the RF & AV unit. There is a pin on the expansion connector on the NES front loader by which a cartridge can send its audio to be mixed with the audio from the NES's APU. However, this pin must be bridged with a resistor to an unused pin on the cartridge connector to mix the audio.
NES RGB Mod with Expansion Audio : retrogaming
https://www.reddit.com/r/retrogaming/comments/4e6n08/nes_rgb_mod_with_expansion_audio/
This video doesn't do this NES justice. My camera had some trouble focusing on the video at first. I modded this NES for RGB a little while ago and finally decided to start trying to figure out expansion audio. The mod to the NES is pretty easy but also required a mod to my Famicom -> NES adapter. It sounds amazing!
NESAVS - RetroRGB
https://www.retrorgb.com/nesavs.html
Audio / Famicom Expansion Audio: The original Famicom had more extended audio capabilities then the NES. It’s proven to be extremely hard to emulate some of these audio channels and even later revisions of the console such as the AV Famicom sound different then the original.
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