recorderSoundVolumeDetect(interval = 100) Start or Stop to detect Sound Volume Decibel, interval (Integer Optional) interval > 0 --> start to detect sound volume decibel according to the time interval (miliseconds), interval <= 0 --> stop to detect sound volume decibel, Return None . If you want to detect Sound Volume Decibel while record sound , you need run recorderStartMicrophone first , then call recorderSoundVolumeDetect .