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Showing content from https://github.com/audacity/audacity/issues/1389 below:

Auto duck misses sections · Issue #1389 · audacity/audacity · GitHub

Initially reported on https://forum.audacityteam.org/viewtopic.php?f=46&t=119468

Describe the bug
Auto duck misses sections on long audio files, if the control track has quiet sections, but not full silences and the threshold is choosen to be very low.

To Reproduce
Steps to reproduce the behavior:

1. Have a long audio file (1h+); generated tone works
2. Have a control track of equal length which has quiet sections (-72dBFS), ie a noise floor. A full mute won't reproduce this.
3. Select the entire track to duck
4. Apply the auto duck effect using a -50dB threshold (-49dB didn't reproduce this)

Expected behavior
All sections are ducked

Screenshots
can be found in the forum: https://forum.audacityteam.org/viewtopic.php?f=46&t=119468

Additional information (please complete the following information):

• OS: Windows 10 (OP), Ubuntu (steve)
• Version: Audacity 3.0.3, 3.0.2 and 3.0.0 tested

Additional context
It works when ducking shorter sections (~20 mins) of the whole file.
There is a workaround available (temporarily amplify the control track, apply the auto-duck with a higher threshold, de-amplify it again).

I'll try finding a root cause next week.

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