Works perfectly.
This device is use to enhance the sound of some game on your NES Front Loader.
Simply remove the lid underneath your NES front loader, break the plastic cover, and insert the audio expansion the right way and that’s it, no soldering is required. It’s very important NOT to insert it the wrong way as it will damage your system. We are not responsible if that happens, i will also contact the buyer before i ship to send you a Youtube video that i found online on how to insert it.

For the game Lagrange Pointe, if you don’t have a audio expansion you will not be able to hear background music at all.

This device will not work on all games.

It will work with Castlevania 3 Japanese version, Lagrange Pointe, Pac Man Championship Edition , Erika , Digital Devil 2 , Mr. Gimmick the japanese version, etc,