Thanks for sharing the log and settings file!
The new log file shows that the plugin is running and the actions are being performed.
Code:
...
19:21:35.998: [adv-ss] started
...
19:21:48.020: [adv-ss] running macro: MASTER-STANDBY
19:21:48.020: [adv-ss] running actions of MASTER-STANDBY
19:21:48.020: [adv-ss] performed action "AdvSceneSwitcher.action.audio.type.sourceVolume" for source "COUNTDOWN" with volume 1.000000 with fade 1 3.000000
...
I also imported your settings file and was able to see the source volume fading as expected for the macros where this setting is enabled. (MASTER-STANDBY and CAM 1 (MAIN) WITH BORDER)
I am at a bit off a loss as to why this would not be working on your side.
Would you mind hoping in a discord / zoom / teams / whatever ... call where you can share your screen so I can have a look at the problem live?
If you are up for it, please contact me directly by sending me a DM here on the forum.