...To get best of the Noise Gate filter, set Close Threshold to minimum and set Open Threshold to maximum, then adjust Open Threshold until level meter in Audio Mixer pane begins to react (to environmental noise, if you adjusting mic), and then make adjustments to the Close Threshold again (about 8 dB lower). For example, Close Threshold = -96 bB, Open Threshold = 0 dB, you'll find out that at Open Threshold = -30 dB level meter begins to react, then set Close Threshold = -38 dB. Threshold values are negative, thus -38 dB lower than -30 dB. Close Threshold level value should be lower than Open Threshold. For mic – make all adjustments in silent...