Bargain second-hand items have arrived. The M82 [BASS ENVELOPE FILTER] is a compact bass envelope filter that offers a wide range of effects through its versatile controls. The dry signal and the FX (effect) signal each have independent circuits, and their blending can be adjusted using the volume controls, which helps to cover the often-thin low frequencies. Furthermore, the DECAY and Q knobs allow for a wide range of frequency curve settings, and the SENSITIVITY control allows for attack adjustment, making it suitable for a variety of instruments and playing styles. Players who like to fine-tune their settings should definitely give it a try. *Works well. *Accessories not included, main unit only. *The casing shows signs of use.Input Impedance: 1 MΩ Output Impedance: 100 Ω Max InputLevel: -15 dBV Max Output Level: +8 dBV Noise Floor: -94 dBV Filter Sweep (fc): 76 Hz to 3.2 kHz Sensitivity Range: 46 dB Maximum Sensitivity at 500 Hz fc = 3.2 kHz: -23 dBV fc = 100 kHz: -39 dBV Decay Stop Freq.: 76 Hz to 1.3 kHz Filter Gain at fc Q Min, fc = 76 Hz: +8 dB Q Max, fc = 76 Hz: +18 dB Q Min, fc = 3.2 kHz: +8 dB Q Max, fc = 3.2 kHz: +26 dB FX Range: -∞ to 0 dB Dry Range: -∞ to +6 dB Bypass: True Hardwire Current Draw: 6 mA Power Supply: 9 volts DC