videos in AudioSet
A list of about a million ten-second YouTube clips, each labelled with the sounds in it, that Google published in 2017. Labs use it to train and test general audio and music models.
Including KORG DS-10 Synthesizer - Synthesizer 101 - Lesson 3, KORG DS-10 Synthesizer - Synthesizer 101 - Lesson 8, KORG DS-10 Synthesizer - Synthesizer 101 - Lesson 4