Gimmick famicom reproduction with upgraded audio

The audio cricuit is only temporary. I used the wrong parts so I'm waiting for the right parts to show up before I wire it up neatly and into a case:

It is incredibly hard to believe that audio is coming from an 8-bit era console. Sounds fantastic.

Grambo wrote:

It is incredibly hard to believe that audio is coming from an 8-bit era console. Sounds fantastic.

The game was released in 1992, that's the 16 bit era.

Ok.
The recorded audio sounds great for an 8-bit game on an 8-bit console, which was revisioned and manufactured in the 16-bit era, albeit revised based upon a console that was originally manufactured in 1986, which did not contain the amount of internal oscillators and other various audio synthesis methods required to achieve the complex waveform contained in the previously stated recorded audio within said aforementioned YouTube video.

*BREATH*

The audio hardware used in this cart is from the 16 bit era it's 16 bit audio era audio hardware. You can stick any audio hardware you want into a famicom cartridge I found a thread where a guy installed a mp3 player into his famicom cartridge. The audio in the game isn't generated by an 8-bit console it's generated with the help of an extra audio chip inside of the cartridge. Also you're wrong, the famicom was "originally manufactured" in 1983. In this cartridge the famicom / nes isn't generating all the audio, it's the 16 bit era extra audio chip inside the cartridge that's doing it which is why the cartridge sounds better. Later famicom audio chips found in cartridges like the konami vrc7 in lagrange point makes the game sound like a sega genesis game because it adds fm synthesis.

I do know that the "expansion audio" is just a mix of the console's internal synthesis and the analog audio sent down pins 45/46. Do you know what signal path it takes though? I'm having a bit of a time deciphering the Famicom's schematic (if I'm even looking at the right one to begin with) https://2img.net/r/ihimizer/img70/7050/ntd8bitnes4qk.jpg.
Analog audio goes to the RP2A03? That seems strange to me.

1986 = Typo.
FM synthesis = Awesome.

The way it works is simple. The system audio is fed into pin 45. The cartridge mixes the audio from its own chip(s) with the system audio and outputs it on pin 46. If there's no extra audio hardware than the cartridge just has a straight path from pin 45 to pin 46. It's the same effect as adding new audio chips to the system, except the new audio hardware is contained in the cartridge.