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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/
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 mixed with…
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 …
Nerdly Pleasures: Famicom Expansion Audio Overview
https://nerdlypleasures.blogspot.com/2017/08/famicom-expansion-audio-overview.html
Famicom Expansion Audio Overview. The Famicom was constructed with a feature which was not available to the NES. The Famicom always sent its internal audio to the cartridge port. For most games, the audio was sent back to the system without modification. 26 (of 1,054) licensed Famicom games contained hardware that could produce additional music ...
Open Hidden Sound Channels in the NES | RetroFixes
http://www.retrofixes.com/2014/05/open-hidden-sound-channels-in-nes.html
I rigged up an NES deck so I could swap in various resistor levels and found that 24k was WAY too loud. Testing with Castlevania 3 on the EverDrive N8, the expansion audio was overpowering the internal audio channels at 24k.
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