Xotic Robotalk 2, 2-Channel Envelope Filter, Analog operation, Channels can be used separately or together, Channel A: Louder and more voluminous than the channel B, Channel B: Cleaner sound colour and fewer mids as the channel A, Direct volume: Adjusts the amount of unprocessed/processed signal and operates on channel A + B, Internal DIP switches: Button with 2 switches for the frequencies channel A and 2 switches for the frequencies channel B, Button with 2 switches for input impedance low/medium/active, On / off status LED, 6.3 mm Jack plug in and out, Power supply: 9V Battery or optional 9V DC power supply, Power connector: 2.1 x 5.5 mm, polarity: Inside (-), outside (+), Dimensions (W x D x H): 93 x 117 x 50 mm, Made in USA@+*Channel A controls:*@+@+, Decay: Determines the decay time and the initial frequency of the envelope curve, Resonance: Proportion of envelope curves - feedback, Sensitivity: Determines how sensitive the envelope curve responds to the input signal, ACh Volume: Volume knob/control, On/Off switch with LED status@+*Channel B controls:*@+@+, Decay: Determines the decay time and the initial frequency of the envelope curve, Resonance: Proportion of envelope curves - feedback, Sensitivity: Determines how sensitive the envelope curve responds to the input signal, BCh Volume: Volume knob/control, On/Off switch with LED status