I agree on those 2 programs. Been using and testing for decades now and Amazing Slowdowner and Transcribe seem to have the best algorithms.

The real test of these types of programs is not how they can slow down to 80% of normal but how well they slow down to 30-40%. Most of what I have seen sound like garbage at that extreme level of modification but A.S.D and Transcribe seem to do it very well. To my ears, A.S.D seems to beat out Transcribe but A.S.D will not slow down Video whereas Transcribe will slow down video. You would need an addition program called Gstreamer to help Transcribe do it in the background but that add-in is free from Seventh String Software.

To this day, I still use them both.

As a sidebar, the slowdown settings that YouTube gives you when listening to or watching YouTube streams is absolute garbage compared to anything else.

BIAB2024
Windows 10 Pro
WA6NCB