For me, personally, they come from happy accidents - I experiment with different sound processing techniques and something cool will come out. Starting with found sounds and field recordings always makes something interesting.

(the MIT open courseware on making music with computers gives great info - https://ocw.mit.edu/courses/music-and-theater-arts/21m-361-composing-with-computers-i-electronic-music-composition-spring-2008/)

I have experimented a bit with sort of reversed spectralism (https://fdleone.com/2014/01/28/spectral-music/ and http://www.oxfordwesternmusic.com/view/Volume5/actrade-9780195384857-div1-010011.xml) by taking found sounds and using EQ to only use the frequencies that matched the pitches I wanted…starting with that might give you something halfway between sounds and pitches like you are describing…

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