Sigmoid probability threshold for deactivation (defaults to
max(activationThreshold - 0.15, 0.01)).
Maximum (ms) of buffered speech per utterance.
Trailing silence (ms) before reporting END_OF_SPEECH.
Minimum speech duration (ms) before reporting START_OF_SPEECH.
Pre-roll (ms) included in the speech buffer ahead of START_OF_SPEECH.
Sigmoid probability threshold for activation.