Source Effect Preset Chain Asset - where is it? - 4.19p3

Sorry to bump this one but my question is pretty much the same. I think I have the new audio engine turned on (I added the line of code to the .ini file, and I can add the Synth Components to BPs etc.) but the Sound Effect Source Presets and the other stuff are not showing up in my content browser. Not under Audio, not under Misc. What am I missing? Thanks