Thank you very much for replying. 
Your work is awesome.
I am known for breaking audio things and reporting. So yeah, I guess I hit it. Everything is set up to use the new audio engine (-audiomixer, windows setting file) and ofc I also raised the max voices of the project to 128, so I’m playing 100 sources at the same time. This are the audio-stats just when I start playing:
After 1-2 seconds the stats normalize.
When I release my button the AudioComponent is stopped. The bugs only happen very rarely. Here is a video.
Just in case you might find time to test, this is the project, uploaded to weTransfer, 3rd person game template with some custom player character blueprint action going on, press play, enable stat audio, press & release LMB.
https://we.tl/ORuUBOmTMd
Source bus sounds sexy! But I wonder, since I am no audio programmer, decoding audio sounds like decoding COMPRESSED audio, in UE I don’t see any way to use PCM, it always uses vorbis for all audio. That correct? What about simply reading out PCM?