Hidden Sounds?The original Famicom (Japanese Nintendo) consoles are superior in design compared to the American NES. One long forgotten feature is the extra sound channel, this extra channel was disconnected on US console and removed from US games. Castlevania 3 is a classic example. The original Japanese version has a much different theme song.
With the development in modern SD card to NES adapters like PowerPak/EverDrive kits and Famicom game adapters it is possible to play Japaneses games on the NES & hear the lost sound channels.
Disclaimer: This mod requires basic soldering skills and understanding of electronics. Please do not perform this mod without the required skills. I will not be held responsible if you damage your NES. Follow these instructions at your own risk
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
If you need help dismantling a NES please view my tear-down article. Here.
The Mod area is located under the black cartridge loading tray.
Solder a resistor between pins 3 and 9 of the NES expansion connector. The resistor value can be changed to get different volume on that channel. This area is located on the top of the motherboard, near the infamous 72 pin connector.