even though I uploaded this in 2021 I think I made these between 2016-2018. It's been a while so I may not remember how exactly I made them lol. But I know I used audacity for all of them. I had a couple plug-ins for bitcrushing but other than that it was mostly the effects audacity comes with.
I think what I used for effects would be; echo, delay, reverb, phaser, paulstretch, and then bitcrush. I played around a lot with reversing and speed changes too. Most of the time it was slowing something down, layering it with itself, playing with effects, reversing or slicing it up, all sorts of experimenting.
As for sampling? I honestly think it was mostly Windows and Apple sound effects that I played with. There might be a couple odd noises I randomly recorded or played with on a synth but yeah, mostly Windows sound effects I liked.