Stereo mixer levels bug?

I've seen this posted about previously but no replies so thought I'd have a go.
I keyframed a drop in levels from 100 to 0 to fade out the audio but immediately after the zeroed KF, the levels pop back to 100.
I would have thought they would remain at 0 myself from this KF onwards but not so.
I've worked around by trimming the layer back to the zero KF but this is not ideal for all circumstances.
Any ideas?
Running AE 13.1 on Mac Pro 10.9.5.
Ta
Yan

Thank you for reporting this issue. I have verified that this is a bug that was introduced in After Effects 2014.1 (13.1). We will investigate and hope to fix this in a future update.
In my testing, I found that this problem only occurs during RAM preview and audio preview. The problem does not occur when you scrub with audio (CTRL/Cmd + scrub), or when you render the composition via the Render Queue.
A workaround you can use is to set the Left Level and Right Level parameters to 0.01% instead of 0%. This should leave the audio functionally inaudible, and it avoids the bug. If having the audio at 0% is important, at the end of the Stereo Mixer keyframes you could also keyframe the layer's Audio Levels property to 0% to absolutely zero out the audio.
Apologies for the bug.

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