Hi, I'm kohanii.
This site sells a kit to turn your Nintendo Famicom into a pseudo-stereo system.
This pseudo-stereo takes advantage of the fact that the Nintendo Famicom audio is output from two separate pins on 2A03.
Image from NesDev
AUX A outputs two pulse channels, and AUX B outputs triangle, noise, and DPCM.
Originally, these two were mixed to mono (R5, R4) and output through a cassette.(Details from the schematic link above).
In this kit, the two are mixed well on the left and right to create pseudo-stereo.
So, to find out how it works, I recorded the AUX A and B outputs.
The System Requirements looks like this.
I modified the kit mentioned above to have AUX B on the left and AUX A on the right for stereo output.
I used a ZOOM U-44 to record at 96KHz 24bit.
I have not advanced MOTHER that far, so I recorded as much background music as I could.
Try to listen
The audio is MP3 with the highest possible quality. (48KHz approx. 290Kbps)
FLAC (96KHz 16bit) with lossless compression is also scheduled to be released.
The image is from this kit.
School/Tinkle Elementary School
Fighting the big guy(Battle 3)
Battle with the Eagle(Battle 2)
Battle with the Crows(Battle 1)
Defeat the big guy(Victory)
I used corrscope to display the oscilloscope.