Comment by stereosteve

The Audio Signal Processing for Machine Learning [1] youtube playlist is a pretty excellent course on sound processing for ML. In particular, the MFCC video. [2]

[1] https://www.youtube.com/watch?v=iCwMQJnKk2c&list=PL-wATfeyAM...

[2] https://www.youtube.com/watch?v=4_SH2nfbQZ8