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Thank you for your kind words. It should still be reacting to the environment and updating itself – the vadThreshold isn’t an absolute volume level, but a s/n ratio setting, so it should continue to make sense as those values change. But you might not be able to use a value which is as aggressive as 3.9, since it will tend to reject real speech under normal circumstances.
What is your experience under changing circumstances using a value like 3.0? Your feedback is appreciated on this, since even though I have a lot of different audio in my tests, there’s no substitute for real-world feedback and this is part of the new Pocketsphinx code.