I've just realized that changes introduced to audio streams a clip in the Clip Properties > Audio Properties widget seem to have no effect at all. That includes: Switching the stream on/off, Normalize, Swap channels, Copy Channels, and Gain. Audio sync parameter does work. I've tested it with both A/V clips and audio clips. I'm on Windows, so perhaps it's a Windows only issue?
I've revised past (Windows) versions of the program, and found out that: 20.04.1 works ok. 20.08.0 does not work. 20.04.1 It still did not have the specific "Audio Properties" tab. The only options for audio then available were the switch to disable/enable the stream, and the audio sync parameter. Both worked fine. 20.08.0 It introduced the "Audio Properties" tab. The stream switch did not work anymore. The audio sync option worked fine (it worked in every newer version launched, up until current trunk master).
Forgot to make a clear resume: "Audio Properties" stream settings are broken since 20.08.0 version, up until today. Audio sync, on the other hand, always worked fine.
An amendment: currently the actual "Audio streams" switch (the one with the Speaker icon) still works. I now realize that was the same that was working back in 20.04.1, before the introduction of the Audio Properties tab. The switch that doesn't work is the checkbox to the left of the each audio stream in the list. When unchecked, the audio graph in the Clip Monitor shows a line (as if the audio was muted) but the audio still reproduces.
Created attachment 181668 [details] Audio Properties settings working status.
I continued checking the issue... Well, I must admit those settings indeed do work. 😅 My problem when testing them, was assuming that the effects of changing them will be seen in the Clip Monitor (while I've just discovered that they are only visible (audible) when the clips are in the Timeline). That's good news, of course, because it means there is nothing wrong with the code (at least in the form of a bug). :) That said, it makes sense to me that these kind of global clip changes, that affect all instances of the clip in the project, would be seen in the Clip Monitor. (In fact, the Video Properties settings changes are immediately visible in the Clip Monitor, so that's kind of an inconsistency). Sorry for the inaccurate report, and thanks for listening!