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 Audiorealism ABL3 Synthesizer - The Best Roland TB-303 Emulation, DFX- Digital Multi Effects (Fingerlab) - Synth Instruments and Individual Effects, Roland SYSTEM-1 Plug-In/Out Synthesizer - Part 1