https://nerdlypleasures.blogspot.com/2016/09/famciom-vs-av-famicom-external-internal.html
https://nerdlypleasures.blogspot.com/2018/01/famicom-nes-simple-tweaks-to-restore.html

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Other resources:

https://nintendosegajapan.com/2016/07/07/famulator-famicom-clone-mod-to-fix-the-audio/
http://www.age.jp/~k-matsu/Games/famicompati/kaizou/famulator/
https://forums.nesdev.org/viewtopic.php?f=9&t=11987&start=15#p175200