Thank you <3
No, I use an app called nanoloop, all the sounds are generated with the app, except the voices and the noise sound in the second song.
There are many ways to make the sound, you can try programs like LSDJ for game boy or just samplin sounds. Little-scale has some really cool samplepacks from the atari 2600 or sega megadrive for free if you're interested. Or, if you want to use the things you have and not download other thing, you can generate a square, saw or triangle wave and add some distortion to the wave, and that generate a sound similar to the old soundchips.
I hope this help you nwn
If you want you cand send me a message to my instagram or bluesky and ask me to any related stuff nwn.