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NES Expanded Audio: 100k Pot Mod - The Curriculum Crasher

https://curriculumcrasher.com/2017/01/24/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 additional channels, the balance is very inconsistent. This is due to variability in the chips added to Famicom cartridges and to the Famicom Disk System and how they were …

Everdrive N8 & Famicom Expansion Audio to NESRGB

http://www.firebrandx.com/edn8tonesrgb.html

Everdrive N8 & Famicom Expansion Audio into NESRGB Mod: With the Everdrive N8 new firmware coming soon featuring improved expansion audio emulation (especially for VRC6 in Japanese Castlevania III), I decided to make a web guide with pictures on how to mix the expansion audio from the Everdrive N8 and/or a Famicom-to-NES adapter into the NESRGB board installed on a …

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

NES Stereo Modifications with Easy Schematics - RetroFixes

http://www.retrofixes.com/2013/09/nes-stereo-modifications-with-easy.html

NES Stereo Modifications with Easy Schematics The NES came with a standard mono output. This was perfectly acceptable in 1986 but with the advancement in home theater systems and Chiptune musicians stereo separation is needed. This modification will bypass the hum inducing RF box, greatly improving the sound quality.

Nerdly Pleasures: Famicom Expansion Audio Overview

https://nerdlypleasures.blogspot.com/2017/08/famicom-expansion-audio-overview.html

Konami's first venture into expansion sound came with its VRC-VI chip. This chip could produce extra three channels of audio. There are two pulse wave channels with eight duty cycle selections and 12-bit frequency control. It also has a sawtooth channel with 12-bit frequency control. Sawtooth waves have a bright, brassy sound.

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